Changes in Ecclesiastical Jurisdictions

in Italy

Italy
DateAscendingChange
40Diocese of Taormina was established
42Diocese of Catania was established
50Papal See of Roma was established
100Diocese of Agrigento was established
100Diocese of Benevento was established
100Diocese of Napoli was established
100Diocese of Nepi was established
100Diocese of Palermo was established
100Diocese of Pozzuoli was established
100Diocese of Spoleto was established (without ecclesiastical province)
100Diocese of Thurio was established
100Diocese of Tricala was established
100Diocese of Vescovìo was established
140Diocese of Terni was established
200Diocese of Aquileia was established
200Diocese of Capua was established
200Diocese of Forlì was established
200Diocese of Milano (Ambrosian Rite) was established
200Diocese of Nola was established
200Diocese of Ostia was established (became suffragan of Roma)
200Diocese of Todi was established
200Diocese of Tortona was established
200Diocese of Trento was established
237Diocese of Fondi was established
250Diocese of Trani was established
259Diocese of Lentini was established
280Diocese of Fossombrone was established
300Diocese of Amiterno was established
300Diocese of Ancona was established
300Diocese of Arezzo was established
300Diocese of Assisi was established (without ecclesiastical province)
300Diocese of Asti was established
300Diocese of Bologna was established
300Diocese of Cagliari was established
300Diocese of Calvi was established
300Diocese of Carini was established
300Diocese of Chiusi was established (became suffragan of Roma)
300Diocese of Civitavecchia was established (without ecclesiastical province)
300Diocese of Claterna was established
300Diocese of Eca was established
300Diocese of Eclena was established
300Diocese of Erdonia was established
300Diocese of Faenza was established
300Diocese of Fermo was established
300Diocese of Firenze was established
300Diocese of Forlimpopoli was established
300Diocese of Formia was established
300Diocese of Forum Clodii was established
300Diocese of Genova was established
300Diocese of Labico was established
300Diocese of Lucca was established (without ecclesiastical province)
300Diocese of Modena was established
300Diocese of Nuceria was established
300Diocese of Padova was established
300Diocese of Palestrina was established (became suffragan of Roma)
300Diocese of Parma was established
300Diocese of Pesaro was established (without ecclesiastical province)
300Diocese of Pisa was established
300Diocese of Pistoia was established
300Diocese of Pitinum was established
300Diocese of Porto was established (became suffragan of Roma)
300Diocese of Ravenna was established
300Diocese of Rimini was established (without ecclesiastical province)
300Diocese of Septempeda was established
300Diocese of Siena was established (became suffragan of Roma)
300Diocese of Siracusa was established
300Diocese of Sora was established
300Diocese of Teano was established
300Diocese of Terracina was established (without ecclesiastical province)
300Diocese of Torres was established
300Diocese of Tre Taverne was established
300Diocese of Vercelli was established
300Diocese of Verona was established
301Diocese of Voghenza was established
308Diocese of Sala Consilina was established
312Diocese of Grumentum was established
313Diocese of Atella was established
313Diocese of Liternium was established
323Diocese of Acqui was established
323Diocese of Aosta was established
326Diocese of Albano was established (became suffragan of Roma)
340Diocese of Bari was established
340Diocese of Canosa was established
350Diocese of Albenga was established
350Diocese of Brescia was established
350Diocese of Imola was established
350Diocese of Narni was established
350Diocese of Pavia was established
350Diocese of Pitinum Merges was established (without ecclesiastical province)
350Diocese of Tivoli was established (without ecclesiastical province)
355Diocese of Aquileia was promoted as Metropolitan Archdiocese of Aquileia (with suffragan sees Pavia, Poreč, Trento and Verona)
372Diocese of Brescello was established (from the suppressed Diocese of Parma)
372Diocese of Parma was suppressed (to establish Diocese of Brescello)
374Diocese of Lodi was established (became suffragan of Milano)
374Diocese of Milano (Ambrosian Rite) was promoted as Metropolitan Archdiocese of Milano (with suffragan sees Acqui, Albenga, Asti, Bologna, Brescia, Faenza, Genova, Lodi, Modena, Tortona, Vercelli and Voghenza)
375Diocese of Altino was established
380Diocese of Concordia was established (became suffragan of Aquileia)
380Diocese of Zuglio was established
386.11.01Diocese of Como was established (from Metropolitan Archdiocese of Milano and became suffragan of Milano)
397Diocese of Novara was established (became suffragan of Milano)
400Diocese of Acerenza was established
400Diocese of Alba was established (became suffragan of Milano)
400Diocese of Anzio was established
400Diocese of Ascoli Piceno was established
400Diocese of Bergamo was established (became suffragan of Milano)
400Diocese of Bettona was established
400Diocese of Bomarzo was established
400Diocese of Brindisi was established
400Diocese of Castellammare di Stabia was established
400Diocese of Caudium was established
400Diocese of Celano was established
400Diocese of Cingoli was established
400Diocese of Cornus was established
400Diocese of Egnazia Appula was established
400Diocese of Ferento was established
400Diocese of Fiesole was established
400Diocese of Gubbio was established (without ecclesiastical province)
400Diocese of Lilibeo was established
400Diocese of Lucera was established
400Diocese of Matelica was established
400Diocese of Nocera Umbra was established
400Diocese of Nomento was established
400Diocese of Osimo was established (without ecclesiastical province)
400Diocese of Otranto was established
400Diocese of Otricoli was established
400Diocese of Pesto was established
400Diocese of Piacenza was established (became suffragan of Milano)
400Diocese of Pitinum was suppressed (to Diocese of Amiterno)
400Diocese of Plestia was established
400Diocese of Pollentia was established
400Diocese of Potenza Picena was established
400Diocese of Sarsina was established
400Diocese of Siponto was established
400Diocese of Squillace was established (without ecclesiastical province)
400Diocese of Termini Imerese was established
400Diocese of Tharros was established
400Diocese of Tolentino was established
400Diocese of Torino was established (became suffragan of Milano)
400Diocese of Treia was established
400Diocese of Treviso was established (became suffragan of Aquileia)
400Diocese of Urbisaglia was established
400Diocese of Volterra was established
439Diocese of Galazia in Campania was established
440Diocese of Ivrea was established (became suffragan of Milano)
440Diocese of Ravenna was promoted as Metropolitan Archdiocese of Ravenna (with suffragan sees Faenza, Forlì, Imola, Modena and Voghenza)
450Diocese of Amelia was established
450Diocese of Aquaviva was established
450Diocese of Aquino was established
450Diocese of Aveia Vestina was established
450Diocese of Camerino was established
450Diocese of Carmeiano was established
450Diocese of Città di Castello was established (without ecclesiastical province)
450Diocese of Cremona was established (became suffragan of Milano)
450Diocese of Cuma was established
450Diocese of Faleri was established
450Diocese of Falerone was established
450Diocese of Forum claudii was established
450Diocese of Gabi was established
450Diocese of Gualdo Tadino was established
450Diocese of Labico was suppressed (to establish Diocese of Subaugusta)
450Diocese of Montecassino was established
450Diocese of Ofena was established
450Diocese of Reggio Emilia was established (became suffragan of Milano)
450Diocese of Salpi was established
450Diocese of Sant’Angelo in Vado was established
450Diocese of Subaugusta was established (from Papal See of Roma and from the suppressed Diocese of Labico)
450Diocese of Sulmona was established
450Diocese of Sutri was established
450Diocese of Tarquinia was established
450Diocese of Tronto was established
450Diocese of Valva was established
450Diocese of Velletri was established (became suffragan of Roma)
451Diocese of Vibo Valentia was established
457Diocese of Blera was established
460Diocese of Telese was established
465Diocese of Luni was established
465Diocese of Numana was established
465Diocese of Passo Corese was established
480Diocese of Anagni was established (without ecclesiastical province)
480Diocese of Fano was established
480Diocese of Ferentino was established (without ecclesiastical province)
480Diocese of Foligno was established (without ecclesiastical province)
480Diocese of Lorium was established
480Diocese of Venafro was established
484Diocese of Cagliari was promoted as Metropolitan Archdiocese of Cagliari (with suffragan sees Tharros and Torres)
484Diocese of Forum Traiani was established
484Diocese of Sulci was established
490Diocese of Alife was established
490Diocese of Arna was established
490Diocese of Avellino was established
490Diocese of Bolsena was established
490Diocese of Chieti was established
490Diocese of Minturno was established
490Diocese of Norcia was established
490Diocese of Perugia was established
490Diocese of Populonia was established
490Diocese of Potenza was established
490Diocese of Roselle was established
490Diocese of Salerno was established
490Diocese of Segni was established
490Diocese of Sessa Aurunca was established
490Diocese of Sorrento was established
490Diocese of Taranto was established
498Diocese of Tindari was established
499Diocese of Cerveteri was established
500Diocese of Agropoli was established
500Diocese of Belluno was established
500Diocese of Bevagna was established
500Diocese of Bisenzio was established
500Diocese of Blanda was established
500Diocese of Bovino was established
500Diocese of Bussento was established
500Diocese of Cervia was established (became suffragan of Roma)
500Diocese of Claterna was suppressed (to Diocese of Imola)
500Diocese of Erdonia was suppressed (to Diocese of Eca)
500Diocese of Falerone was suppressed
500Diocese of Fausania was established (became suffragan of Cagliari)
500Diocese of Fidene was established
500Diocese of Foro Flaminii was established
500Diocese of Gallipoli was established
500Diocese of Isernia was established
500Diocese of Labico was restored (from the suppressed Diocese of Subaugusta)
500Diocese of Larino was established
500Diocese of Lipari was established
500Diocese of Locri was established
500Diocese of Meria was established
500Diocese of Messina was established
500Diocese of Miseno was established
500Diocese of Montecassino was suppressed (to Diocese of Aquino)
500Diocese of Ostra was established
500Diocese of Penne was established (without ecclesiastical province)
500Diocese of Pollentia was suppressed (to Diocese of Camerino)
500Diocese of Reggio Calabria was established
500Diocese of Rieti was established (without ecclesiastical province)
500Diocese of Senigallia was established (without ecclesiastical province)
500Diocese of Sepino was established
500Diocese of Spello was established
500Diocese of Subaugusta was suppressed (to establish Diocese of Labico)
500Diocese of Teramo was established (from the suppressed Diocese of Tronto)
500Diocese of Treba was established
500Diocese of Trevi was established
500Diocese of Tronto was suppressed (to establish Diocese of Teramo)
500Diocese of Venosa was established
501.10.25Diocese of Lorium was suppressed (to establish Diocese of Santa Rufina)
501.10.25Diocese of Santa Rufina was established (from the suppressed Diocese of Lorium)
502Diocese of Aquaviva was suppressed (to Diocese of Santa Rufina)
529Abbacy nullius of Montecassino was restored (from Diocese of Aquino)
530Diocese of Bari was promoted as Metropolitan Archdiocese of Bari
534Diocese of Bettona was suppressed (to Diocese of Assisi)
542Diocese of Trieste was established (from Diocese of Cittanova and became suffragan of Aquileia)
546Diocese of Strongoli was established
550Diocese of Alatri was established (without ecclesiastical province)
550Diocese of Anzio was suppressed (to Diocese of Albano)
550Diocese of Arna was suppressed (to Diocese of Assisi)
550Diocese of Carmeiano was suppressed
550Diocese of Celano was suppressed
550Diocese of Crotone was established
550Diocese of Oderzo was established
550Diocese of Ofena was suppressed (to Diocese of Valva)
550Diocese of Ostra was suppressed (to Diocese of Senigallia)
550Diocese of Potenza Picena was suppressed
550Diocese of Sabiana was established (became suffragan of Aquileia)
550Diocese of Terni was suppressed (to Diocese of Narni)
557Diocese of Trieste lost territory to Diocese of Cittanova
558Metropolitan Archdiocese of Aquileia was promoted as Patriarchal See of Aquileia
560Diocese of Cingoli was suppressed (to Diocese of Osimo)
560Diocese of Plestia was suppressed (to Diocese of Camerino)
560Diocese of Septempeda was suppressed (to Diocese of Camerino)
560Diocese of Tolentino was suppressed (to Diocese of Camerino)
560Diocese of Treia was suppressed (to Diocese of Camerino)
560Diocese of Urbisaglia was suppressed (to Diocese of Camerino)
569Diocese of Altino lost territory to Diocese of Treviso
569Diocese of Oderzo lost territory to Diocese of Treviso
570Diocese of Feltre was established (became suffragan of Grado)
570Patriarchal See of Grado was established (from Patriarchal See of Aquileia and with suffragan sees Belluno, Feltre, Malamocco and Padova)
570Diocese of Malamocco was established (from Diocese of Padova and became suffragan of Grado)
575Diocese of Egnazia Appula was suppressed (to Diocese of Brindisi)
578Diocese of Matelica was suppressed (to Diocese of Camerino)
580Diocese of Asolo was established
580Abbacy nullius of Montecassino was suppressed
580Diocese of Ortona was established
580Diocese of Tarquinia was suppressed (to establish Diocese of Tuscanella)
580Diocese of Tuscanella was established (from the suppressed Diocese of Tarquinia)
580Diocese of Vicenza was established (from Diocese of Padova and became suffragan of Aquileia)
590Diocese of Amalfi was established
590Diocese of Nicotera was established
590Diocese of Orvieto was established (from Diocese of Bolsena and without ecclesiastical province)
590Diocese of Sant’Angelo in Vado was suppressed (to Diocese of Città di Castello and to establish Diocese of Urbino)
590Diocese of Urbino was established (from the suppressed Diocese of Sant’Angelo in Vado)
590Diocese of Uselli was established (became suffragan of Cagliari)
592Diocese of Tre Taverne was suppressed (to Diocese of Velletri)
593.02Diocese of Passo Corese was suppressed (to Diocese of Nomento)
595.09Diocese of Carini was suppressed (to Diocese of Reggio Calabria)
600Diocese of Agropoli was suppressed (to Diocese of Pesto)
600Diocese of Alesa was established
600Diocese of Aveia Vestina was suppressed (to establish Diocese of Forconio)
600Diocese of Bagnoregio was established (from Diocese of Bolsena and without ecclesiastical province)
600Diocese of Brixen was established (from the suppressed Diocese of Sabiana and became suffragan of Aquileia)
600Diocese of Caorle was established (from Diocese of Concordia)
600Diocese of Caudium was suppressed (to Diocese of Benevento)
600Diocese of Cesena was established (became suffragan of Ravenna)
600Diocese of Cirella was established
600Diocese of Cosenza was established
600Diocese of Forconio was established (from the suppressed Diocese of Aveia Vestina)
600Diocese of Jesi was established (without ecclesiastical province)
600Diocese of Malvito was established
600Diocese of Milazzo was established
600Diocese of Forum Clodii was renamed as Diocese of Monterano
600Diocese of Roselle lost territory to Diocese of Siena
600Diocese of Ruvo was established
600Diocese of Sabiana was suppressed (to establish Diocese of Brixen)
600Diocese of Tauriano was established
602Diocese of Carini was restored (from Diocese of Reggio Calabria)
610Diocese of Meria was renamed as Diocese of Tropea
628.06.11Abbacy nullius of San Colombano was established (from Diocese of Piacenza)
635Diocese of Eraclea was established (from the suppressed Diocese of Oderzo)
635Diocese of Oderzo was suppressed (to establish Diocese of Eraclea)
639Diocese of Altino was suppressed (to Diocese of Treviso and to establish Diocese of Torcello)
639Diocese of Torcello was established (from the suppressed Diocese of Altino)
640Diocese of Adria was established (became suffragan of Ravenna)
653Diocese of Terni was restored (from Diocese of Narni)
668Diocese of Eca lost territory to Diocese of Benevento
670Diocese of Ceneda was established (from Diocese of Eraclea and became suffragan of Aquileia)
670Diocese of Eraclea lost territory to Diocese of Treviso
670Diocese of Sovana was established (became suffragan of Roma)
670Diocese of Ventimiglia was established (became suffragan of Milano)
674Diocese of Brindisi was renamed as Diocese of Brindisi–Oria
680Diocese of Bisenzio was suppressed (to establish Diocese of Castro del Lazio)
680Diocese of Brescello was suppressed (to establish Diocese of Parma)
680Diocese of Castro del Lazio was established (from the suppressed Diocese of Bisenzio)
680Diocese of Cefalù was established (became suffragan of Siracusa)
680Diocese of Parma was restored (from the suppressed Diocese of Brescello and became suffragan of Milano)
680Diocese of Siracusa was promoted as Metropolitan Archdiocese of Siracusa (with suffragan sees Cefalù and Messina)
680Diocese of Vado Ligure was established (became suffragan of Milano)
682Diocese of Castro was established
690Diocese of Bolsena was suppressed (to Diocese of Orvieto)
700Diocese of Alessano was established
700Diocese of Bisarcio was established
700Diocese of Bussento was suppressed
700Diocese of Pitinum Merges was renamed as Diocese of Cagli
700Diocese of Comacchio was established (became suffragan of Ravenna)
700Diocese of Ferento was suppressed (to Diocese of Bomarzo)
700Diocese of Fidene was suppressed
700Diocese of Gallese was established
700Diocese of Grumentum was suppressed
700Diocese of Miseno was suppressed (to Diocese of Cuma)
700Diocese of Orte was established
700Diocese of Ortona was suppressed (to Diocese of Chieti)
700Diocese of Otricoli was suppressed (to Diocese of Narni)
700Diocese of Polignano was established
700Abbacy nullius of Pomposa was established
700Diocese of Rosella was established
700Diocese of Tharros was renamed as Diocese of Sinis-Tharros
700Diocese of Sulci was suppressed
700Diocese of Trento lost territory to Diocese of Feltre and Diocese of Sabiana
718Abbacy nullius of Montecassino was restored
730Diocese of Reggio Calabria was promoted as Metropolitan Archdiocese of Reggio Calabria (with suffragan sees Cosenza, Locri, Nicotera, Tauriano, Tropea and Vibo Valentia)
740Diocese of Bisignano was established (from Diocese of Thurio and became suffragan of Reggio Calabria)
740Diocese of Conza was established
740Diocese of Veroli was established (without ecclesiastical province)
740Diocese of Zuglio was suppressed (to Patriarchal See of Aquileia)
743Diocese of Torres was suppressed
744Diocese of Aquino lost territory to Abbacy nullius of Montecassino
744Diocese of Formia lost territory to Abbacy nullius of Montecassino
744Diocese of Teano lost territory to Abbacy nullius of Montecassino
744Diocese of Venafro lost territory to Abbacy nullius of Montecassino
750Diocese of Fausania was suppressed
750Abbacy nullius of Nonantola was established (from Diocese of Modena)
750Diocese of Sala Consilina was suppressed (to Diocese of Pesto)
750Diocese of Suèssola was established
750Diocese of Tre Taverne was restored (from Diocese of Velletri)
760Diocese of Priverno was established (without ecclesiastical province)
760Diocese of Terni was suppressed (to Diocese of Spoleto)
774Diocese of Olivolo was established (from Diocese of Malamocco and became suffragan of Grado)
775Abbacy nullius of Farfa was established
785Diocese of Montefeltro was established (became suffragan of Ravenna)
787Diocese of Locri was renamed as Diocese of Santa Ciriaca
790Diocese of Sezze was established (without ecclesiastical province)
800Diocese of Cornus was suppressed (to Diocese of Sinis-Tharros)
800Diocese of Equilio was established
800Diocese of Foro Flaminii was suppressed (to Diocese of Foligno)
800Diocese of Genova lost territory to Diocese of Tortona
800Diocese of Gravina was established
800Diocese of Norma was established
800Diocese of Pavia lost territory to Diocese of Tortona
800Diocese of Venafro was suppressed
804Diocese of Mantova was established (from Diocese of Verona and became suffragan of Aquileia)
820Diocese of Massa Marittima e Populonia was established (from the suppressed Diocese of Populonia)
820Diocese of Populonia was suppressed (to establish Diocese of Massa Marittima e Populonia)
827Diocese of Carini was suppressed
835Diocese of Agrigento was suppressed
837Diocese of Tricala was suppressed
844Diocese of Canosa lost territory to Diocese of Trani
844Diocese of Sepino was suppressed
846Diocese of Formia was suppressed (to establish Diocese of Gaeta)
846Diocese of Gaeta was established (from the suppressed Diocese of Formia and without ecclesiastical province)
870Diocese of Cefalù was suppressed
870Diocese of Otranto was promoted as Archdiocese of Otranto
870Diocese of Tre Taverne was suppressed (to Diocese of Velletri)
878Diocese of Alesa was suppressed
878Diocese of Lipari was suppressed
878.05.21Metropolitan Archdiocese of Siracusa was suppressed
880Diocese of Catania was suppressed
880Diocese of Lentini was suppressed
880Diocese of Messina was suppressed
880Diocese of Tindari was suppressed
885Metropolitan Archdiocese of Santa Severina was established (from Diocese of Crotone and with suffragan see Gallipoli)
890Diocese of Gabi was suppressed (to Diocese of Palestrina)
890Diocese of Termini Imerese was suppressed
893Diocese of Bovino was suppressed (to Diocese of Benevento)
900Diocese of Amantea was established (became suffragan of Reggio Calabria)
900Diocese of Bevagna was suppressed (to Diocese of Spoleto)
900Diocese of Canne was established
900Diocese of Eraclea was suppressed (to Diocese of Belluno)
900Diocese of Santa Ciriaca was renamed as Diocese of Locri
900Diocese of Marsi was established
900Diocese of Matera was established (from Diocese of Acerenza)
900Diocese of Milazzo was suppressed
900Diocese of Minervino was established
900Diocese of Monterano was suppressed (to Diocese of Sutri)
900Diocese of Nicastro was established (became suffragan of Reggio Calabria)
900Diocese of Orvieto lost territory to Diocese of Bagnoregio
900Diocese of Perugia lost territory to Diocese of Bagnoregio
900Abbacy nullius of San Colombano lost territory to Diocese of Tortona
900Diocese of Spello was suppressed (to Diocese of Spoleto)
902Diocese of Nicotera was suppressed (to Diocese of Tropea)
906Diocese of Taormina was suppressed
910Diocese of Lilibeo was suppressed
917Diocese of Vicenza lost territory to Diocese of Padova
940Diocese of Termoli was established
940Diocese of Trivento was established
944.05Diocese of Nomento was suppressed (to Diocese of Vescovìo)
950Diocese of Belcastro was established (from Metropolitan Archdiocese of Santa Severina and became suffragan of Santa Severina)
950Diocese of Blanda was suppressed (to establish Diocese of Cassano all’Jonio)
950Diocese of Cassano all’Jonio was established (from the suppressed Diocese of Blanda and Diocese of Thurio)
950Diocese of Ferrara was established (from the suppressed Diocese of Voghenza and became suffragan of Milano)
950Diocese of Plestia was restored (from Diocese of Camerino)
950Diocese of Rossano was established (from the suppressed Diocese of Thurio and became suffragan of Reggio Calabria)
950Diocese of Thurio was suppressed (to establish Diocese of Cassano all’Jonio and Diocese of Rossano)
950Diocese of Voghenza was suppressed (to establish Diocese of Ferrara)
956Archdiocese of Otranto was promoted as Metropolitan Archdiocese of Otranto (with suffragan sees Acerenza and Alessano)
960Diocese of Ariano was established
960Diocese of Atina was established (from Diocese of Sora)
960Diocese of Cerenzia was established
966.08.14Diocese of Caiazzo was established (became suffragan of Capua)
966.08.14Diocese of Capua was promoted as Metropolitan Archdiocese of Capua (with suffragan sees Aquino, Atina, Caiazzo, Calvi, Fondi, Forum claudii, Gaeta, Sessa Aurunca, Sora and Teano)
968Diocese of Tricarico was established (became suffragan of Otranto)
968Diocese of Tursi was established
969.05.26Diocese of Ascoli Satriano was established (from Diocese of Benevento and became suffragan of Benevento)
969.05.26Diocese of Benevento was promoted as Metropolitan Archdiocese of Benevento (with suffragan sees Alife, Ariano, Ascoli Satriano, Avellino, Eclena, Larino, Sant’Agata de’ Goti, Siponto and Telese and lost territory to establish Diocese of Ascoli Satriano and Diocese of Sant’Agata de’ Goti)
969.05.26Diocese of Sant’Agata de’ Goti was established (from Diocese of Benevento and became suffragan of Benevento)
969.08.10Diocese of Asolo was suppressed (to Diocese of Padova, Diocese of Treviso and Diocese of Vicenza)
970Diocese of Bovino was restored (from Metropolitan Archdiocese of Benevento and became suffragan of Benevento)
970Diocese of Norma was suppressed (to Diocese of Velletri)
970Diocese of Taranto was promoted as Metropolitan Archdiocese of Taranto
983.06Diocese of Salerno was promoted as Metropolitan Archdiocese of Salerno (with suffragan sees Acerenza, Bisignano, Conza, Cosenza, Malvito, Nola and Pesto)
984Diocese of Lavello was established
987.02.13Diocese of Amalfi was promoted as Metropolitan Archdiocese of Amalfi (with suffragan sees Capri, Lettere, Minori and Scala and lost territory to establish Diocese of Capri, Diocese of Lettere, Diocese of Minori and Diocese of Scala)
987.02.13Diocese of Capri was established (from Diocese of Amalfi and became suffragan of Amalfi)
987.02.13Diocese of Lettere was established (from Diocese of Amalfi and became suffragan of Amalfi)
987.02.13Diocese of Minori was established (from Diocese of Amalfi and became suffragan of Amalfi)
987.02.13Diocese of Scala was established (from Diocese of Amalfi and became suffragan of Amalfi)
990Diocese of Vieste was established (from Diocese of Siponto)
992Diocese of Vado Ligure was renamed as Diocese of Savona
996Diocese of Eraclea was restored (from Diocese of Belluno)
999.01.07Diocese of Treviso lost territory to Diocese of Eraclea
1000Diocese of Acquaputrida was established (became suffragan of Benevento)
1000Diocese of Biccari was established (became suffragan of Benevento)
1000Diocese of Bitonto was established (became suffragan of Bari)
1000Diocese of Città della Pieve was established (without ecclesiastical province)
1000Diocese of Gravina was suppressed
1000Diocese of Minturno was suppressed (to Diocese of Gaeta)
1000Diocese of Montepeloso was established
1000Diocese of Napoli was promoted as Metropolitan Archdiocese of Napoli (with suffragan see Pozzuoli)
1000Diocese of Norcia was suppressed (to Diocese of Spoleto)
1000Diocese of Rossano was promoted as Archdiocese of Rossano
1000Abbacy nullius of Sacra di San Michele was established
1000Abbacy nullius of San Pietro di Novalesa was established (from Diocese of Torino)
1000Abbacy nullius of Santa Maria di Sesto was established
1000Abbacy nullius of Santa Maria di Vangadizza was established
1000Diocese of Sarno was established (became suffragan of Salerno)
1000Diocese of Sinis-Tharros was promoted as Metropolitan Archdiocese of Sinis-Tharros
1000Diocese of Tocco Caudio was established (became suffragan of Benevento)
1000Diocese of Trevico was established (became suffragan of Benevento)
1002Diocese of Suelli was established
1006Diocese of Gualdo Tadino was suppressed (to Diocese of Nocera Umbra)
1006Diocese of Plestia was suppressed (to Diocese of Foligno, Diocese of Nocera Umbra and Diocese of Spoleto)
1013Abbacy nullius of Sansepolcro was established (from Diocese of Città di Castello)
1014.02.14Diocese of Bobbio was established (from Diocese of Piacenza, Diocese of Tortona and Abbacy nullius of San Colombano)
1015Diocese of Bomarzo was suppressed (to Diocese of Bagnoregio)
1015Diocese of Tortiboli was established (became suffragan of Benevento)
1019Diocese of Eca was suppressed (to establish Diocese of Troia)
1019Diocese of Troia was established (from the suppressed Diocese of Eca)
1020Diocese of Giovinazzo was established (became suffragan of Bari)
1020Diocese of Molfetta was established (became suffragan of Bari)
1023Diocese of Castellaneta was established (became suffragan of Taranto)
1023Diocese of Mottola was established (became suffragan of Taranto)
1025Diocese of Oppido Mamertina was established (from Diocese of Tauriano and became suffragan of Reggio Calabria)
1030Diocese of Brindisi–Oria was promoted as Metropolitan Archdiocese of Brindisi–Oria (with suffragan see Monopoli and lost territory to establish Diocese of Monopoli)
1030Diocese of Monopoli was established (from Diocese of Brindisi–Oria and became suffragan of Brindisi–Oria)
1030Diocese of Umbriatico was established
1032Diocese of Venafro was restored (became suffragan of Capua)
1033Diocese of Civita Castellana was established (from the suppressed Diocese of Faleri and without ecclesiastical province)
1033Diocese of Faleri was suppressed (to establish Diocese of Civita Castellana)
1036Diocese of Ischia was established (became suffragan of Napoli)
1039Diocese of Dragonara was established (became suffragan of Benevento)
1040Diocese of Luni lost territory to Diocese of Massa Marittima e Populonia
1040Diocese of Muro Lucano was established
1042Diocese of Montepeloso was suppressed (to Diocese of Tricarico)
1047Abbacy nullius of San Giovanni in Venere was established (from Diocese of Chieti)
1049Diocese of Monteverde was established (became suffragan of Salerno)
1050Diocese of Cefalù lost territory to Diocese of Palermo
1050Diocese of Cerveteri was suppressed (to Diocese of Porto)
1050Diocese of Massa Lubrense was established (from Diocese of Sorrento)
1050Diocese of Melfi was established (without ecclesiastical province)
1050Diocese of Montemarano was established (became suffragan of Benevento)
1050Diocese of Ostuni was established (from Metropolitan Archdiocese of Brindisi–Oria and became suffragan of Brindisi–Oria)
1050Diocese of Sorrento was promoted as Metropolitan Archdiocese of Sorrento (with suffragan see Castellammare di Stabia and lost territory to establish Diocese of Massa Lubrense and Diocese of Vico Equense)
1050Diocese of Sulci was restored
1050Diocese of Vico Equense was established (from Diocese of Sorrento)
1053Diocese of Atella was suppressed (to establish Diocese of Aversa)
1053Diocese of Aversa was established (from the suppressed Diocese of Atella and Diocese of Liternium and became suffragan of Napoli)
1053Diocese of Liternium was suppressed (to establish Diocese of Aversa)
1054Diocese of Luni lost territory to Diocese of Pisa
1056Diocese of Acerra was established (from the suppressed Diocese of Suèssola and became suffragan of Napoli)
1056Diocese of Suèssola was suppressed (to Diocese of Sant’Agata de’ Goti and to establish Diocese of Acerra)
1057Diocese of Lecce was established (became suffragan of Otranto)
1057Diocese of Senigallia lost territory to Diocese of Fossombrone
1058.03.24Diocese of Marsico Nuovo was established (from former Diocese of Grumentum and became suffragan of Salerno)
1058.03.24Diocese of Martirano was established (became suffragan of Salerno)
1058.03.24Diocese of Policastro was established (from former Diocese of Bussento and became suffragan of Salerno)
1059Diocese of Acerenza was promoted as Archdiocese of Acerenza
1059Diocese of Eclena was suppressed (to establish Diocese of Frigento)
1059Diocese of Fiorentino was established (became suffragan of Benevento)
1059Diocese of Frigento was established (from the suppressed Diocese of Eclena and became suffragan of Benevento)
1059Diocese of Guardialfiera was established (became suffragan of Benevento)
1059Diocese of Montecorvino was established (became suffragan of Benevento)
1059Diocese of Nicotera was restored (from Diocese of Tropea)
1059Diocese of Vulturara was established (became suffragan of Benevento)
1059.05Diocese of Cosenza was promoted as Archdiocese of Cosenza
1060Diocese of Amiterno was suppressed (to Diocese of Rieti)
1060Diocese of Boiano was established (became suffragan of Benevento)
1060Diocese of Civitate was established
1060Diocese of Gravina was restored
1060Diocese of Rapolla was established (without ecclesiastical province)
1063Diocese of Trani was promoted as Metropolitan Archdiocese of Trani
1064Diocese of Siponto was promoted as Archdiocese of Siponto
1065Diocese of Carini lost territory to Metropolitan Archdiocese of Palermo
1065Diocese of Lilibeo lost territory to Metropolitan Archdiocese of Palermo
1065Diocese of Palermo was promoted as Metropolitan Archdiocese of Palermo (gained territory from Diocese of Carini, Diocese of Lilibeo and Diocese of Termini Imerese)
1065Diocese of Termini Imerese lost territory to Metropolitan Archdiocese of Palermo
1068.04.13Archdiocese of Acerenza was promoted as Metropolitan Archdiocese of Acerenza (with suffragan sees Gravina, Matera, Potenza, Tricarico, Tursi and Venosa)
1070Diocese of Bisceglie was established
1070Diocese of Bova was established (from Diocese of Locri)
1070Diocese of Dolia was established
1070Diocese of Gallura was restored
1073Diocese of Ampurias was established (became suffragan of Torres)
1073Diocese of Bosa was established (from Metropolitan Archdiocese of Sinis-Tharros and became suffragan of Torres)
1073Diocese of Castro was established (became suffragan of Torres)
1073Diocese of Sorres was established (became suffragan of Torres)
1073Metropolitan Archdiocese of Torres was restored (with suffragan sees Ampurias, Bisarcio, Bosa, Castro and Sorres)
1074Diocese of Olivolo was renamed as Diocese of Castello
1076Diocese of Nusco was established (from Metropolitan Archdiocese of Benevento and became suffragan of Salerno)
1078Abbacy nullius of San Michele Arcangelo di Montescaglioso was established
1078Abbacy nullius of Santa Maria ad Abbadia Alpina was established
1080Diocese of Conversano was established (from Metropolitan Archdiocese of Bari and became suffragan of Bari)
1080Diocese of Conza was promoted as Metropolitan Archdiocese of Conza (with suffragan sees Lacedonia, Monteverde, Muro Lucano and Sant’Angelo dei Lombardi)
1080Diocese of Forum Traiani was suppressed (to establish Diocese of Santa Giusta)
1080Diocese of Locri was renamed as Diocese of Gerace
1080Diocese of Lacedonia was established (became suffragan of Conza)
1080Diocese of Santa Giusta was established (from the suppressed Diocese of Forum Traiani)
1080Diocese of Sant’Angelo dei Lombardi was established (became suffragan of Conza)
1080Diocese of Ugento was established
1081Metropolitan Archdiocese of Reggio Calabria lost territory to Diocese of Bova and Diocese of Oppido Mamertina
1081Abbacy nullius of Santissimo Salvatore (Italo-Albanese Rite) was established
1081.02.04Diocese of Mileto was established (from the suppressed Diocese of Vibo Valentia and without ecclesiastical province)
1081.02.04Diocese of Vibo Valentia was suppressed (to establish Diocese of Mileto)
1082Diocese of Matera was suppressed (to Metropolitan Archdiocese of Acerenza)
1082Diocese of Troina was established (from former Diocese of Lipari, former Diocese of Messina, former Diocese of Taormina and former Diocese of Tindari)
1086Diocese of Ravello was established (from Metropolitan Archdiocese of Amalfi and without ecclesiastical province)
1086Diocese of Siracusa was restored (from former Diocese of Catania and former Diocese of Lentini)
1088Diocese of Agrigento was restored (from Metropolitan Archdiocese of Palermo and former Diocese of Tricala and without ecclesiastical province)
1088.08.23Diocese of Treba was suppressed (to Diocese of Anagni)
1090Diocese of Acerno was established (became suffragan of Salerno)
1090Diocese of Bisaccia was established (became suffragan of Conza)
1090Abbacy nullius of Nardò was established (from Diocese of Gallipoli)
1090Diocese of Ploaghe was established (became suffragan of Torres)
1092.03.09Diocese of Catania was restored (from Diocese of Siracusa)
1092.04.21Diocese of Pisa was promoted as Metropolitan Archdiocese of Pisa (with suffragan sees Accia, Mariana and Nebbio)
1093Diocese of Blera was suppressed (to Diocese of Tuscanella)
1093Diocese of Civitavecchia was suppressed (to Diocese of Tuscanella)
1093Diocese of Mazara del Vallo was established (from Metropolitan Archdiocese of Palermo and became suffragan of Palermo)
1093Metropolitan Archdiocese of Oristano was established (from the suppressed Metropolitan Archdiocese of Sinis-Tharros and with suffragan see Uselli)
1093Metropolitan Archdiocese of Sinis-Tharros was suppressed (to establish Metropolitan Archdiocese of Oristano)
1093.10.03Diocese of Tauriano was suppressed (to Diocese of Mileto)
1094Diocese of Amantea was suppressed (to Diocese of Tropea)
1098Diocese of Messina was restored (from the suppressed Diocese of Troina)
1098Abbacy nullius of Santissima Trinità di Mileto was established
1098Diocese of Troina was suppressed (to establish Diocese of Messina)
1098.07.20Diocese of Satriano was established (became suffragan of Conza)
1099Diocese of Forum claudii was renamed as Diocese of Carinola
1099Diocese of Città della Pieve was suppressed (to Diocese of Chiusi)
1099Archdiocese of Siponto was promoted as Metropolitan Archdiocese of Siponto (with suffragan see Vieste)
1100Diocese of Acquaputrida was suppressed (to Diocese of Frigento)
1100Diocese of Andria was established (from Metropolitan Archdiocese of Trani and became suffragan of Trani)
1100Diocese of Biccari was suppressed
1100Diocese of Limosano was established (became suffragan of Benevento)
1100Abbacy nullius of Massa Carrara was established (from Diocese of Lucca)
1100Diocese of Rosella was suppressed
1100Territorial Abbacy of Subiaco was established (from Diocese of Tivoli)
1100Diocese of Tocco Caudio was suppressed
1100Metropolitan Archdiocese of Trani lost territory to Metropolitan Archdiocese of Nazareth
1100Diocese of Trevi was suppressed (to Diocese of Spoleto)
1101.08.07Metropolitan Archdiocese of Bari was renamed as Metropolitan Archdiocese of Bari e Canosa
1101.08.07Diocese of Canosa was demoted as Archpresbyterate nullius of Canosa
1106Diocese of Chioggia was established (from the suppressed Diocese of Malamocco and became suffragan of Grado)
1106Diocese of Malamocco was suppressed (to establish Diocese of Chioggia)
1110Diocese of Anglona was established (from the suppressed Diocese of Tursi and became suffragan of Acerenza)
1110Diocese of Ottana was established (became suffragan of Torres)
1110Archpresbyterate nullius of Santa Maria Assunta di Carpi was established (from Diocese of Reggio Emilia)
1110Diocese of Tursi was suppressed (to establish Diocese of Anglona)
1113Diocese of Caserta was established (from Metropolitan Archdiocese of Capua, from the suppressed Diocese of Galazia in Campania and became suffragan of Napoli)
1113Diocese of Gallura was renamed as Diocese of Civita
1113Diocese of Galazia in Campania was suppressed (to establish Diocese of Caserta)
1114Provostry nullius of Borgo San Donnino was established (from Diocese of Parma and Diocese of Piacenza)
1114Diocese of Isola was established
1119Diocese of Porto was renamed as Diocese of Porto e Santa Rufina (gained territory from the suppressed Diocese of Santa Rufina)
1119Diocese of Santa Rufina was suppressed (to Diocese of Porto e Santa Rufina)
1120Diocese of Galtellì was established (from Diocese of Civita)
1120Diocese of Labico was suppressed (to establish Diocese of Tusculum)
1120Diocese of Tusculum was established (from the suppressed Diocese of Labico and became suffragan of Roma)
1121Diocese of Catanzaro was established (from Diocese of Squillace)
1123Diocese of Montepeloso was restored (from Diocese of Tricarico and became suffragan of Acerenza)
1126.05Territorial Abbacy of Montevergine was established (from Diocese of Avellino and became suffragan of Benevento)
1130Diocese of Terralba was established
1131.09.04Diocese of Cefalù was restored (from Diocese of Agrigento)
1133Diocese of Montepeloso was suppressed (to Diocese of Andria)
1133.03.19Diocese of Genova was promoted as Metropolitan Archdiocese of Genova (with suffragan sees Accia, Bobbio, Mariana and Nebbio)
1133.05.27Diocese of Brugnato was established (from Metropolitan Archdiocese of Genova and Diocese of Luni and became suffragan of Genova)
1138.04.09Diocese of Grosseto was established (from the suppressed Diocese of Roselle and became suffragan of Roma)
1138.04.09Diocese of Roselle was suppressed (to establish Diocese of Grosseto)
1140Diocese of Atina was demoted as Provostry nullius of Atina (lost territory to Diocese of Sora and without ecclesiastical province)
1140Abbacy nullius of Santi Vincenzo ed Anastasio alle Tre Fontane was established
1144Abbacy nullius of Fontevivo was established (from Diocese of Parma)
1144Abbacy nullius of Santa Maria di Polsi was established
1150Diocese of Ostia was renamed as Diocese of Ostia–Velletri (gained territory from the suppressed Diocese of Velletri)
1150Diocese of Velletri was suppressed (to Diocese of Ostia–Velletri)
1153Diocese of Limosano was suppressed (to Metropolitan Archdiocese of Benevento)
1157Diocese of Lipari was restored (from Diocese of Messina)
1157Diocese of Patti was established (from Diocese of Messina)
1159Diocese of Cirella was suppressed (to establish Diocese of San Marco)
1159Diocese of Malvito was suppressed (to establish Diocese of San Marco)
1159Diocese of San Marco was established (from the suppressed Diocese of Cirella and Diocese of Malvito and without ecclesiastical province)
1160Diocese of Capaccio was established (from the suppressed Diocese of Pesto and became suffragan of Salerno)
1160Diocese of Pesto was suppressed (to establish Diocese of Capaccio)
1162Diocese of Albenga lost territory to Metropolitan Archdiocese of Genova
1162Diocese of Luni lost territory to Metropolitan Archdiocese of Genova
1166Diocese of Messina was promoted as Metropolitan Archdiocese of Messina (with suffragan sees Cefalù, Lipari and Patti)
1169Diocese of Lettere was renamed as Diocese of Lettere–Gragnano
1170Diocese of Bitetto was established (from Metropolitan Archdiocese of Bari e Canosa)
1174Abbacy nullius of Santa Maria Nuova di Monreale was established (from Metropolitan Archdiocese of Palermo)
1175Diocese of Alessandria was established (from Diocese of Acqui, Diocese of Asti and Diocese of Tortona and became suffragan of Milano)
1176Diocese of Mazara del Vallo lost territory to Abbacy nullius of Santa Maria Nuova di Monreale
1176Metropolitan Archdiocese of Palermo lost territory to Abbacy nullius of Santa Maria Nuova di Monreale
1177Diocese of Treviso lost territory to Diocese of Torcello
1179Archdiocese of Cosenza was promoted as Metropolitan Archdiocese of Cosenza (with suffragan see Martirano)
1182Diocese of Uselli was renamed as Diocese of Ales
1183.02.05Abbacy nullius of Santa Maria Nuova di Monreale was promoted as Metropolitan Archdiocese of Monreale (with suffragan see Catania)
1191Abbacy nullius of San Salvatore Maggiore was established (from Diocese of Rieti)
1191Diocese of Tusculum was renamed as Diocese of Tusculum–Frascati
1192.08.03Diocese of Viterbo was established (from Diocese of Tuscanella and without ecclesiastical province)
1194Diocese of Sovana lost territory to Diocese of Orvieto
1198Diocese of Assisi lost territory to Diocese of Perugia
1198Diocese of Imola lost territory to Diocese of Bologna
1200Diocese of Lesina was established (became suffragan of Benevento)
1200Abbacy nullius of San Giusto di Susa was established (from Diocese of Torino)
1200Diocese of San Leone was established (from Diocese of Belcastro)
1203.05.07Archdiocese of Matera was restored (from Metropolitan Archdiocese of Acerenza)
1206Territorial Prelature of Santa Lucia del Mela was established (from Diocese of Patti and without ecclesiastical province)
1207Diocese of Cuma was suppressed (to Diocese of Aversa and Diocese of Pozzuoli)
1218.01.13Diocese of Terni was restored (from Diocese of Narni and Diocese of Spoleto and without ecclesiastical province)
1221.03.26Archpresbyterate nullius of Acquaviva delle Fonti was established (from Metropolitan Archdiocese of Bari e Canosa)
1228Diocese of Fiesole exchanged territory with Diocese of Firenze
1228Diocese of Firenze exchanged territory with Diocese of Fiesole
1230Metropolitan Archdiocese of Siponto was renamed as Metropolitan Archdiocese of Manfredonia
1230Diocese of Sovana lost territory to Abbacy nullius of Santi Vincenzo ed Anastasio alle Tre Fontane
1239Diocese of Noli was established (from Diocese of Savona and became suffragan of Genova)
1240Diocese of Comacchio lost territory to Diocese of Cervia
1240.05.22Diocese of Osimo was suppressed (to establish Diocese of Recanati)
1240.05.22Diocese of Recanati was established (from Diocese of Numana and from the suppressed Diocese of Osimo)
1240.11.15Diocese of Recanati lost territory to Diocese of Numana
1243Diocese of Lodi was suppressed
1248Archpresbyterate nullius of Altamura was established (from Diocese of Bitetto)
1248Diocese of Tortona lost territory to Metropolitan Archdiocese of Genova
1251.04.01Diocese of Atri was established (from Diocese of Penne)
1252Diocese of Lodi was restored (became suffragan of Milano)
1257.02.20Diocese of Forconio was suppressed (to establish Diocese of L’Aquila)
1257.02.20Diocese of L’Aquila was established (from Diocese of Rieti and from the suppressed Diocese of Forconio)
1260Diocese of Nuceria was suppressed (to Metropolitan Archdiocese of Amalfi and Metropolitan Archdiocese of Salerno)
1263.07.27Diocese of Recanati was suppressed (to Diocese of Numana)
1264.03.13Diocese of Osimo was restored (from Diocese of Numana)
1285Diocese of Gallese was suppressed (to Diocese of Civita Castellana)
1289.12.01Diocese of Recanati was restored (from Diocese of Numana)
1300Abbacy nullius of San Martino al Monte Cimino was established
1304Diocese of Nicotera was suppressed (to Diocese of Mileto)
1310Diocese of Mileto lost territory to Metropolitan Archdiocese of Reggio Calabria
1320Diocese of Osimo was renamed as Diocese of Osimo e Cingoli
1320.11.18Diocese of Macerata was established (from Diocese of Camerino and Diocese of Fermo and from the suppressed Diocese of Recanati)
1320.11.18Diocese of Recanati was suppressed (to establish Diocese of Macerata)
1322.05.02Abbacy nullius of Montecassino was promoted as Diocese of Montecassino
1325.06.19Diocese of Cortona was established (from Diocese of Arezzo, Diocese of Chiusi and Diocese of Città di Castello)
1327Metropolitan Archdiocese of Nazareth in Barletta was established (from Metropolitan Archdiocese of Trani and from the suppressed Metropolitan Archdiocese of Nazareth)
1334Diocese of Eraclea lost territory to Diocese of Treviso
1356.01.08Diocese of Recanati was restored (from Diocese of Macerata)
1360Diocese of Bertinoro was established (from the suppressed Diocese of Forlimpopoli)
1360Diocese of Forlimpopoli was suppressed (to establish Diocese of Bertinoro)
1367.03.31Diocese of Montecassino was demoted as Territorial Abbacy of Montecassino
1368.07.12Diocese of Osimo e Cingoli was renamed as Diocese of Osimo
1369.08.31Diocese of Montefiascone was established (from Diocese of Bagnoregio, Diocese of Castro del Lazio, Diocese of Orvieto, Diocese of Tuscanella and Diocese of Viterbo)
1384.10.10Diocese of Nuceria was restored (from Metropolitan Archdiocese of Amalfi and Metropolitan Archdiocese of Salerno and became suffragan of Salerno)
1386Collegiate nullius of Colle di Val d’Elsa was established (from Diocese of Volterra)
1388.06.05Diocese of Mondovì was established (from Diocese of Asti and became suffragan of Milano)
1392.08.14Diocese of Nicotera was restored (from Metropolitan Archdiocese of Reggio Calabria and became suffragan of Reggio Calabria)
1394.08.07Diocese of Cava was established (from Metropolitan Archdiocese of Salerno and without ecclesiastical province)
1401.03.08Abbacy nullius of San Cristoforo di Castel Durante was established (from Diocese of Urbino)
1410Diocese of Fiorentino was suppressed (to Diocese of Lucera)
1413.01.13Abbacy nullius of Nardò was promoted as Diocese of Nardò (without ecclesiastical province)
1419.05.10Diocese of Firenze was promoted as Metropolitan Archdiocese of Firenze (with suffragan sees Fiesole and Pistoia)
1420.02.12Diocese of Suelli was suppressed (to Metropolitan Archdiocese of Cagliari)
1422.10.19Diocese of Ancona was renamed as Diocese of Ancona e Umana (gained territory from the suppressed Diocese of Numana)
1422.10.19Diocese of Numana was suppressed (to Diocese of Ancona e Umana)
1424Diocese of Salpi was suppressed (to Metropolitan Archdiocese of Trani)
1425Territorial Abbacy of San Paolo fuori le Mura was established
1425Diocese of Tortiboli was suppressed (to Diocese of Lucera)
1426Diocese of Valva lost territory to Diocese of L’Aquila
1429Diocese of Nuceria was renamed as Diocese of Nocera de’ Pagani
1430Metropolitan Archdiocese of Pisa lost territory to Metropolitan Archdiocese of Genova
1435.12.05Diocese of Corneto was restored (from Diocese of Tuscanella)
1437.03.20Diocese of Cariati was established (from Archdiocese of Rossano and became suffragan of Santa Severina)
1440Diocese of Eraclea was suppressed (to Patriarchal See of Grado)
1441Metropolitan Archdiocese of Torres was renamed as Metropolitan Archdiocese of Sassari
1449Archpresbyterate nullius of Lanciano was established (from Diocese of Chieti)
1451.10.08Diocese of Castello was suppressed (to establish Patriarchal See of Venezia)
1451.10.08Patriarchal See of Grado was suppressed (to establish Patriarchal See of Venezia)
1451.10.08Patriarchal See of Venezia was established (from the suppressed Patriarchal See of Grado and Diocese of Castello and with suffragan sees Belluno, Chioggia, Cittanova, Feltre and Padova)
1452Diocese of Montepeloso was restored (from Diocese of Andria and without ecclesiastical province)
1452.07.28Diocese of Porto e Santa Rufina was renamed as Diocese of Porto (lost territory to establish Diocese of Santa Rufina)
1452.07.28Diocese of Santa Rufina was restored (from Diocese of Porto e Santa Rufina)
1454.03.22Diocese of Porto was renamed as Diocese of Porto e Santa Rufina (gained territory from the suppressed Diocese of Santa Rufina)
1454.03.22Diocese of Santa Rufina was suppressed (to Diocese of Porto e Santa Rufina)
1455.04.30Archpresbyterate nullius of Cerignola was established (from Archpresbyterate nullius of Canosa)
1459.04.23Diocese of Siena was promoted as Metropolitan Archdiocese of Siena (with suffragan sees Chiusi, Grosseto, Massa Marittima e Populonia and Sovana)
1462.08.13Diocese of Montalcino was established (from Diocese of Arezzo, Diocese of Chiusi and Diocese of Grosseto)
1462.08.13Diocese of Pienza was established (from Diocese of Arezzo and Diocese of Chiusi)
1463.09.05Provostry nullius of Santo Stefano di Prato was established (from Diocese of Pistoia and without ecclesiastical province)
1465.07.21Diocese of Luni was renamed as Diocese of Luni–Sarzana
1466Diocese of Equilio was suppressed (to Patriarchal See of Venezia)
1471Archpresbyterate nullius of Guastalla was established (from Diocese of Reggio Emilia)
1474.04.18Diocese of Casale Monferrato was established (from Diocese of Asti and Diocese of Vercelli and became suffragan of Milano)
1480Collegiate nullius of Montepulciano was established (from Diocese of Arezzo)
1495.06.21Diocese of Sabina was established (from Diocese of Vescovìo and became suffragan of Roma)
1495.09.11Diocese of Galtellì was suppressed (to Metropolitan Archdiocese of Cagliari)
1495.09.18Diocese of Vescovìo was suppressed (to Diocese of Sabina)
1502.01.24Diocese of Città Ducale was established (from Diocese of Rieti)
1503.11.26Diocese of Iglesias was established (from the suppressed Diocese of Sulci and became suffragan of Cagliari)
1503.11.26Diocese of Sulci was suppressed (to establish Diocese of Iglesias)
1503.12.08Diocese of Alghero was established (from Metropolitan Archdiocese of Sassari, from the suppressed Diocese of Bisarcio, Diocese of Castro and Diocese of Ottana and became suffragan of Sassari)
1503.12.08Diocese of Bisarcio was suppressed (to establish Diocese of Alghero)
1503.12.08Diocese of Castro was suppressed (to establish Diocese of Alghero)
1503.12.08Diocese of Dolia was suppressed (to Metropolitan Archdiocese of Cagliari)
1503.12.08Diocese of Ottana was suppressed (to establish Diocese of Alghero)
1503.12.08Diocese of Ploaghe was suppressed (to Metropolitan Archdiocese of Sassari)
1503.12.08Diocese of Santa Giusta was suppressed (to Metropolitan Archdiocese of Oristano)
1503.12.08Diocese of Sorres was suppressed (to Metropolitan Archdiocese of Sassari)
1505.11.08Diocese of Città Ducale was suppressed (to Diocese of Rieti)
1507Apostolic Administration of Loreto was established (from Diocese of Recanati)
1508.10.17Diocese of Città Ducale was restored (from Diocese of Rieti)
1511.10.29Diocese of Saluzzo was established (from Diocese of Alba, Diocese of Asti and Diocese of Torino and without ecclesiastical province)
1512.02.01Diocese of Modena lost territory to Archpresbyterate nullius of Santa Maria Assunta di Carpi
1512.02.01Abbacy nullius of Nonantola lost territory to Archpresbyterate nullius of Santa Maria Assunta di Carpi
1513Territorial Abbacy of Santissima Trinità di Cava de’ Tirreni was established (from Diocese of Cava)
1515.05.01Diocese of Reggio Emilia lost territory to Archpresbyterate nullius of Santa Maria Assunta di Carpi
1515.05.21Diocese of Torino was promoted as Metropolitan Archdiocese of Torino (with suffragan sees Asti, Ivrea and Mondovì)
1515.06.27Diocese of Chieti lost territory to Diocese of Lanciano
1515.06.27Archpresbyterate nullius of Lanciano was promoted as Diocese of Lanciano (gained territory from Diocese of Chieti and without ecclesiastical province)
1515.09.22Diocese of Arezzo lost territory to Abbacy nullius of Sansepolcro
1515.09.22Diocese of Città di Castello lost territory to Abbacy nullius of Sansepolcro
1519.04.15Territorial Prelature of Pescia was established (from Diocese of Lucca and Diocese of Pistoia and without ecclesiastical province)
1520.09.17Abbacy nullius of Sansepolcro was promoted as Diocese of Sansepolcro (became suffragan of Firenze)
1523Diocese of Salpi was restored (from Metropolitan Archdiocese of Trani)
1525.06.19Diocese of Campagna was established (from Metropolitan Archdiocese of Salerno and Diocese of Satriano and became suffragan of Salerno)
1526.06.01Diocese of Chieti was promoted as Metropolitan Archdiocese of Chieti (with suffragan sees Atri, Lanciano and Penne)
1530.03.14Diocese of Vigevano was established (from Diocese of Novara and Diocese of Pavia and became suffragan of Milano)
1531.03.06Diocese of Giffoni was established (from Metropolitan Archdiocese of Salerno and Diocese of Acerno)
1532.06.28Diocese of Giffoni was suppressed (to Metropolitan Archdiocese of Salerno and Diocese of Acerno)
1534Diocese of Sarno lost territory to Diocese of Nola
1535Diocese of Pavia lost territory to Diocese of Vigevano
1537Diocese of Tusculum–Frascati was renamed as Diocese of Frascati
1545.08.08Diocese of Anglona was renamed as Diocese of Anglona–Tursi
1547.04.22Diocese of Salpi was suppressed (to Metropolitan Archdiocese of Trani)
1561.01.09Diocese of Lanciano was promoted as Metropolitan Archdiocese of Lanciano
1561.11.10Diocese of Arezzo lost territory to Diocese of Montepulciano
1561.11.10Diocese of Chiusi lost territory to Diocese of Montepulciano
1561.11.10Collegiate nullius of Montepulciano was promoted as Diocese of Montepulciano (gained territory from Diocese of Arezzo and Diocese of Chiusi and without ecclesiastical province)
1563.03.17Diocese of Gallese was restored (from Diocese of Civita Castellana)
1563.06.04Diocese of Urbino was promoted as Metropolitan Archdiocese of Urbino (with suffragan sees Cagli, Gubbio, Montefeltro, Pesaro and Senigallia)
1567Diocese of Lesina was suppressed (to Diocese of Larino)
1569.09.16Diocese of Gallese was suppressed (to Diocese of Civita Castellana)
1570.10.20Diocese of Ortona was restored (from Metropolitan Archdiocese of Lanciano and became suffragan of Chieti)
1571.08.01Abbacy nullius of Farfa lost territory to Diocese of Ascoli Piceno
1571.08.01Diocese of Ripatransone was established (from Diocese of Ascoli Piceno, Diocese of Fermo, Diocese of Teramo and Abbacy nullius of Farfa)
1571.11.27Diocese of San Leone was suppressed (to Metropolitan Archdiocese of Santa Severina)
1580.02.21Diocese of Civitate was suppressed (to establish Diocese of San Severo)
1580.02.21Diocese of Dragonara was suppressed (to establish Diocese of San Severo)
1580.02.21Diocese of San Severo was established (from the suppressed Diocese of Civitate and Diocese of Dragonara and became suffragan of Benevento)
1580.04.11Diocese of Crema was established (from Diocese of Cremona, Diocese of Lodi and Diocese of Piacenza and became suffragan of Milano)
1582.12.10Diocese of Bologna was promoted as Metropolitan Archdiocese of Bologna (with suffragan sees Cervia, Crema, Imola, Modena, Parma, Piacenza and Reggio Emilia)
1585.11.05Archpresbyterate nullius of Guastalla was promoted as Abbacy nullius of San Pietro Apostolo di Guastalla
1586Diocese of Osimo lost territory to Diocese of Recanati
1586.03.17Apostolic Administration of Loreto was promoted as Diocese of Loreto (gained territory from Diocese of Macerata, gained territory from the suppressed Diocese of Recanati and without ecclesiastical province)
1586.03.17Diocese of Macerata lost territory to Diocese of Loreto
1586.03.17Diocese of Recanati was suppressed (to Diocese of Loreto)
1586.07.17Diocese of Capaccio was renamed as Diocese of Capaccio–Diano
1586.11.24Diocese of Montalto was established (from Diocese of Ascoli Piceno, Diocese of Fermo, Diocese of Ripatransone and Diocese of Teramo and without ecclesiastical province)
1586.11.26Diocese of San Severino was restored (from Diocese of Camerino)
1586.11.26Diocese of Spoleto lost territory to Diocese of Camerino
1586.12.10Diocese of Tolentino was restored (from Diocese of Camerino)
1588Diocese of Camerino lost territory to Diocese of Macerata
1589.05.24Diocese of Fermo was promoted as Metropolitan Archdiocese of Fermo (with suffragan sees Macerata, Montalto, Ripatransone, San Severino and Tolentino)
1591.05.08Metropolitan Archdiocese of Brindisi–Oria was renamed as Metropolitan Archdiocese of Brindisi (lost territory to establish Diocese of Oria)
1591.05.08Diocese of Oria was established (from Metropolitan Archdiocese of Brindisi–Oria and became suffragan of Taranto)
1592.02.09Diocese of Recanati was restored (from Diocese of Loreto)
1592.04.15Diocese of Fossano was established (from Metropolitan Archdiocese of Torino and Diocese of Asti and became suffragan of Torino)
1592.06.05Collegiate nullius of Colle di Val d’Elsa was promoted as Diocese of Colle di Val d’Elsa (gained territory from Metropolitan Archdiocese of Firenze, Metropolitan Archdiocese of Siena, Diocese of Fiesole and Diocese of Volterra and became suffragan of Firenze)
1592.06.05Diocese of Fiesole lost territory to Diocese of Colle di Val d’Elsa
1592.06.05Metropolitan Archdiocese of Firenze lost territory to Diocese of Colle di Val d’Elsa
1592.06.05Metropolitan Archdiocese of Siena lost territory to Diocese of Colle di Val d’Elsa
1592.06.05Diocese of Volterra lost territory to Diocese of Colle di Val d’Elsa
1600.05.12Diocese of Campli was established (from Diocese of Montalto and Diocese of Teramo)
1600.09.25Diocese of Città della Pieve was restored (from Diocese of Chiusi)
1601.02.12Provostry nullius of Borgo San Donnino was promoted as Diocese of Borgo San Donnino (gained territory from Diocese of Cremona and without ecclesiastical province)
1601.02.12Diocese of Cremona lost territory to Diocese of Borgo San Donnino
1622.12.05Diocese of San Miniato was established (from Diocese of Lucca and became suffragan of Firenze)
1626Abbacy nullius of San Giovanni in Venere lost territory to Metropolitan Archdiocese of Chieti
1629.03.07Papal See of Roma lost territory to Diocese of Porto e Santa Rufina
1635.02.08Diocese of Sant’Angelo in Vado was restored (from Abbacy nullius of San Cristoforo di Castel Durante)
1635.02.08Abbacy nullius of San Cristoforo di Castel Durante was promoted as Diocese of Urbania (lost territory to establish Diocese of Sant’Angelo in Vado)
1636.10.20Diocese of Città di Castello lost territory to Diocese of Sant’Angelo in Vado
1636.10.20Metropolitan Archdiocese of Urbino lost territory to Diocese of Sant’Angelo in Vado
1638Diocese of Tivoli lost territory to Territorial Abbacy of Subiaco
1639.07.21Diocese of Anagni lost territory to Territorial Abbacy of Subiaco
1649.09.13Diocese of Acquapendente was established (from Diocese of Orvieto, from the suppressed Diocese of Castro del Lazio and without ecclesiastical province)
1649.09.13Diocese of Castro del Lazio was suppressed (to establish Diocese of Acquapendente)
1653Abbacy nullius of Pomposa was suppressed
1653.09.22Provostry nullius of Santo Stefano di Prato was promoted as Diocese of Prato (became suffragan of Firenze)
1656Diocese of Ariano lost territory to Metropolitan Archdiocese of Benevento
1696Archpresbyterate nullius of Acquaviva delle Fonti was suppressed (to Metropolitan Archdiocese of Bari e Canosa)
1700Abbacy nullius of Asola was established
1717.08.13Abbacy nullius of Santissima Trinità di Mileto was suppressed (to Diocese of Mileto)
1725.06.23Diocese of Pontecorvo was established (from Diocese of Aquino and without ecclesiastical province)
1725.08.19Diocese of Cingoli was restored (from Diocese of Osimo)
1726.09.11Diocese of Lucca was promoted as Archdiocese of Lucca
1727Diocese of San Miniato lost territory to Diocese of Pescia
1727.03.17Archdiocese of Lucca lost territory to Diocese of Pescia
1727.03.17Territorial Prelature of Pescia was promoted as Diocese of Pescia (gained territory from Archdiocese of Lucca)
1728.11.15Diocese of Fabriano was established (from Diocese of Camerino)
1731Archpresbyterate nullius of Canosa was promoted as Territorial Prelature of Canosa
1732.06.10Ordinariate of Italia continentale (Italo-Albanese Rite) was established
1735.07.27Diocese of Ferrara was promoted as Archdiocese of Ferrara
1748.12.23Diocese of Pinerolo was established (from Metropolitan Archdiocese of Torino and Abbacy nullius of Santa Maria ad Abbadia Alpina and became suffragan of Torino)
1749.11.26Diocese of Terlizzi was established (from Diocese of Giovinazzo and became suffragan of Bari e Canosa)
1751.07.06Patriarchal See of Aquileia was suppressed (to establish Metropolitan Archdiocese of Gorizia and Metropolitan Archdiocese of Udine)
1751.07.06Metropolitan Archdiocese of Gorizia was established (from the suppressed Patriarchal See of Aquileia and with suffragan sees Koper, Ljubljana and Trieste)
1751.07.06Metropolitan Archdiocese of Udine was established (from the suppressed Patriarchal See of Aquileia and with suffragan sees Ceneda, Concordia, Poreč, Pula, Treviso, Verona and Vicenza)
1755Titular Episcopal See of Sinita was restored
1765.01.18Territorial Abbacy of Monte Oliveto Maggiore was established (from Diocese of Arezzo)
1767Diocese of Ales exchanged territory with Metropolitan Archdiocese of Cagliari
1767Metropolitan Archdiocese of Cagliari exchanged territory with Diocese of Ales
1768Diocese of Alba lost territory to Diocese of Mondovì
1768Diocese of Asti lost territory to Diocese of Mondovì
1770.10.13Diocese of Ischia lost territory to Diocese of Gaeta
1772.04.29Diocese of Spoleto lost territory to Diocese of Foligno
1772.06.01Diocese of Biella was established (from Diocese of Vercelli and became suffragan of Torino)
1772.06.15Diocese of Chiusi lost territory to Diocese of Montalcino
1772.06.15Diocese of Pienza lost territory to Metropolitan Archdiocese of Siena and Diocese of Montalcino
1772.08.03Abbacy nullius of San Pietro di Novalesa lost territory to Diocese of Susa
1772.08.03Abbacy nullius of San Giusto di Susa was promoted as Diocese of Susa (gained territory from Metropolitan Archdiocese of Torino and Abbacy nullius of San Pietro di Novalesa and became suffragan of Torino)
1772.08.03Metropolitan Archdiocese of Torino lost territory to Diocese of Susa
1777Diocese of Rimini lost territory to Diocese of Cesena
1779.07.21Diocese of Galtellì–Nuoro was restored (from Metropolitan Archdiocese of Cagliari, Metropolitan Archdiocese of Oristano and Diocese of Alghero and became suffragan of Cagliari)
1779.12.01Archpresbyterate nullius of Santa Maria Assunta di Carpi was promoted as Diocese of Carpi (became suffragan of Bologna)
1782.09.18Diocese of Volterra lost territory to Diocese of Colle di Val d’Elsa
1784Metropolitan Archdiocese of Bologna lost territory to Diocese of Pistoia
1784Metropolitan Archdiocese of Gorizia lost territory to Diocese of Trieste
1784Diocese of Montefeltro lost territory to Diocese of Sansepolcro
1784Diocese of Pistoia lost territory to Diocese of Pescia
1784Diocese of Trieste lost territory to Diocese of Cittanova, Diocese of Koper and Diocese of Ljubljana
1784.02.06Ordinariate of Silicia (Italo-Albanese Rite) was established
1785.04Diocese of Acquapendente exchanged territory with Diocese of Sovana
1785.04Diocese of Sovana exchanged territory with Diocese of Acquapendente
1785.07.08Diocese of Matelica was restored (from Diocese of Camerino)
1786Diocese of Feltre lost territory to Diocese of Trento
1787Diocese of Bergamo exchanged territory with Metropolitan Archdiocese of Milano
1787Metropolitan Archdiocese of Gorizia lost territory to Diocese of Gurk
1787Metropolitan Archdiocese of Milano (Ambrosian Rite) exchanged territory with Diocese of Bergamo
1787Diocese of Padova lost territory to Diocese of Trento
1787.12.17Diocese of Camerino was promoted as Archdiocese of Camerino
1788.03.08Metropolitan Archdiocese of Gorizia was suppressed (to Metropolitan Archdiocese of Ljubljana and to establish Diocese of Gradisca)
1788.03.08Diocese of Gradisca was established (from the suppressed Metropolitan Archdiocese of Gorizia, Diocese of Pedena and Diocese of Trieste and became suffragan of Ljubljana)
1788.03.08Diocese of Trieste was suppressed (to establish Diocese of Gradisca)
1789Diocese of Pienza lost territory to Diocese of Montalcino
1789.01.16Archpresbyterate nullius of Acquaviva delle Fonti was restored (from Metropolitan Archdiocese of Bari e Canosa)
1789.07.18Archdiocese of Lucca exchanged territory with Metropolitan Archdiocese of Pisa
1789.07.18Metropolitan Archdiocese of Pisa exchanged territory with Archdiocese of Lucca
1791Diocese of Massa Marittima e Populonia lost territory to Diocese of Brugnato
1791.09.12Diocese of Gorizia e Gradisca was restored (from the suppressed Diocese of Gradisca and became suffragan of Ljubljana)
1791.09.12Diocese of Gradisca was suppressed (to establish Diocese of Gorizia e Gradisca and Diocese of Trieste)
1791.09.12Diocese of Trieste was restored (from the suppressed Diocese of Gradisca and became suffragan of Ljubljana)
1792.09.07Abbacy nullius of Santa Maria di Vangadizza was suppressed (to Diocese of Adria)
1794Diocese of Pinerolo lost territory to Diocese of Susa
1794Abbacy nullius of Santa Maria di Sesto was suppressed (to Diocese of Concordia)
1797Diocese of Ventimiglia lost territory to Diocese of Nice
1797.07.04Diocese of Pontremoli was established (from Diocese of Brugnato and Diocese of Luni–Sarzana and became suffragan of Pisa)
1798Metropolitan Archdiocese of Sassari lost territory to Diocese of Alghero
1798.09.18Diocese of Pontremoli lost territory to Metropolitan Archdiocese of Pisa
1801.06.01Diocese of Fossano was suppressed (to Diocese of Mondovì)
1803Diocese of Bertinoro was suppressed (to Metropolitan Archdiocese of Ravenna)
1803Diocese of Brugnato lost territory to Diocese of Ajaccio
1803Archdiocese of Ferrara was promoted as Metropolitan Archdiocese of Ferrara (with suffragan sees Adria, Comacchio, Mantova and Verona)
1803Metropolitan Archdiocese of Genova lost territory to Diocese of Ajaccio
1803Diocese of Grosseto lost territory to Diocese of Ajaccio
1803Diocese of Massa Marittima e Populonia lost territory to Diocese of Ajaccio
1803.03.09Diocese of Bisarcio was restored (from Metropolitan Archdiocese of Sassari and Diocese of Alghero and became suffragan of Sassari)
1803.03.09Diocese of Bosa lost territory to Diocese of Alghero
1803.03.09Metropolitan Archdiocese of Oristano lost territory to Diocese of Bosa
1803.06.01Diocese of Alba was suppressed (to Diocese of Asti)
1803.06.01Diocese of Alessandria was suppressed (to Diocese of Casale Monferrato)
1803.06.01Diocese of Aosta was suppressed (to Diocese of Ivrea)
1803.06.01Diocese of Biella was suppressed (to Diocese of Vercelli)
1803.06.01Diocese of Bobbio was suppressed (to Diocese of Casale Monferrato)
1803.06.01Diocese of Pinerolo was suppressed (to Diocese of Saluzzo)
1803.06.01Diocese of Susa was suppressed (to Metropolitan Archdiocese of Torino)
1803.06.01Diocese of Tortona was suppressed (to Diocese of Casale Monferrato)
1803.06.07Abbacy nullius of Sacra di San Michele was suppressed (to Metropolitan Archdiocese of Torino)
1803.09.01Diocese of Albenga lost territory to Diocese of Mondovì
1805Abbacy nullius of Santa Maria ad Abbadia Alpina was suppressed (to Diocese of Saluzzo)
1805.12.20Diocese of Gallese was restored (from Diocese of Civita Castellana)
1806.09.25Diocese of Livorno was established (from Metropolitan Archdiocese of Pisa and became suffragan of Pisa)
1809.01.02Diocese of Pavia lost territory to Diocese of Piacenza
1810Diocese of Brixen lost territory to Diocese of Belluno
1813Diocese of Reggio Emilia lost territory to Diocese of Mantova
1816.09.12Diocese of Caltagirone was established (from Metropolitan Archdiocese of Messina and Diocese of Catania, gained territory from Diocese of Siracusa and became suffragan of Monreale)
1816.09.12Diocese of Siracusa lost territory to Diocese of Caltagirone
1817Diocese of Bertinoro was restored (from Metropolitan Archdiocese of Ravenna)
1817.02.08Diocese of Treia was restored (from Archdiocese of Camerino)
1817.03.17Diocese of Nicosia was established (from Metropolitan Archdiocese of Messina and Diocese of Catania and became suffragan of Messina)
1817.07.03Diocese of Piazza Armerina was established (from Diocese of Catania and became suffragan of Monreale)
1817.07.17Diocese of Alba was restored (from Diocese of Asti and Diocese of Mondovì and became suffragan of Torino)
1817.07.17Diocese of Alessandria was restored (from Diocese of Casale Monferrato and became suffragan of Vercelli)
1817.07.17Diocese of Aosta was restored (from Diocese of Ivrea and became suffragan of Chambéry)
1817.07.17Diocese of Asti lost territory to Diocese of Mondovì
1817.07.17Diocese of Biella was restored (from Diocese of Vercelli and became suffragan of Vercelli)
1817.07.17Diocese of Casale Monferrato lost territory to Diocese of Acqui
1817.07.17Diocese of Cuneo was established (from Diocese of Mondovì and became suffragan of Torino)
1817.07.17Diocese of Fossano was restored (from Diocese of Mondovì and became suffragan of Torino)
1817.07.17Metropolitan Archdiocese of Milano (Ambrosian Rite) lost territory to Diocese of Novara and Diocese of Vigevano
1817.07.17Diocese of Mondovì lost territory to Metropolitan Archdiocese of Torino and Diocese of Saluzzo
1817.07.17Diocese of Novara lost territory to Diocese of Vigevano
1817.07.17Diocese of Pavia lost territory to Diocese of Vigevano
1817.07.17Diocese of Pinerolo was restored (from Diocese of Saluzzo and became suffragan of Torino)
1817.07.17Diocese of Susa was restored (from Metropolitan Archdiocese of Torino and became suffragan of Torino)
1817.07.17Diocese of Tortona was restored (from Diocese of Casale Monferrato, Diocese of Pavia and Diocese of Piacenza and became suffragan of Genova)
1817.07.17Diocese of Vercelli was promoted as Metropolitan Archdiocese of Vercelli (with suffragan sees Alessandria, Biella and Casale Monferrato and lost territory to establish Diocese of Biella)
1817.10.29Diocese of Alba lost territory to Diocese of Mondovì
1817.11.23Diocese of Bobbio was restored (from Diocese of Casale Monferrato and became suffragan of Genova)
1818Diocese of Bobbio lost territory to Diocese of Tortona
1818.01.31Diocese of Gubbio lost territory to Diocese of Cagli
1818.01.31Diocese of Nocera Umbra lost territory to Diocese of Cagli
1818.01.31Abbacy nullius of Nonantola lost territory to Diocese of Cagli
1818.05.01Diocese of Adria exchanged territory with Metropolitan Archdiocese of Ferrara
1818.05.01Diocese of Belluno lost territory to Diocese of Treviso
1818.05.01Diocese of Caorle was suppressed (to Patriarchal See of Venezia)
1818.05.01Diocese of Concordia exchanged territory with Metropolitan Archdiocese of Udine
1818.05.01Diocese of Feltre lost territory to Diocese of Padova and Diocese of Trento
1818.05.01Metropolitan Archdiocese of Ferrara exchanged territory with Diocese of Adria
1818.05.01Diocese of Padova exchanged territory with Diocese of Vicenza
1818.05.01Metropolitan Archdiocese of Ravenna lost territory to Diocese of Adria
1818.05.01Diocese of Torcello was suppressed (to Patriarchal See of Venezia)
1818.05.01Metropolitan Archdiocese of Udine was demoted as Diocese of Udine (gained territory from Patriarchal See of Venezia, lost territory to Diocese of Ceneda and Diocese of Treviso, exchanged territory with Diocese of Concordia and became suffragan of Venezia)
1818.05.01Patriarchal See of Venezia lost territory to Diocese of Ceneda, Diocese of Gorizia e Gradisca and Diocese of Udine
1818.05.01Diocese of Verona lost territory to Diocese of Padova
1818.05.01Diocese of Vicenza exchanged territory with Diocese of Padova
1818.06.27Archpresbyterate nullius of Acquaviva delle Fonti was suppressed (to Metropolitan Archdiocese of Bari e Canosa)
1818.06.27Diocese of Alessano was suppressed (to Diocese of Ugento)
1818.06.27Diocese of Alife was suppressed (to Diocese of Telese)
1818.06.27Metropolitan Archdiocese of Amalfi was demoted as Archdiocese of Amalfi (gained territory from the suppressed Diocese of Minori, Diocese of Ravello and Diocese of Scala and without ecclesiastical province)
1818.06.27Diocese of Belcastro was suppressed (to Metropolitan Archdiocese of Santa Severina)
1818.06.27Diocese of Bitetto was suppressed (to Metropolitan Archdiocese of Bari e Canosa)
1818.06.27Diocese of Caiazzo was suppressed (to Diocese of Caserta)
1818.06.27Diocese of Campli was suppressed (to Diocese of Teramo)
1818.06.27Diocese of Canne was suppressed (to Metropolitan Archdiocese of Trani)
1818.06.27Territorial Prelature of Canosa was suppressed (to Diocese of Andria)
1818.06.27Diocese of Capri was suppressed (to Metropolitan Archdiocese of Sorrento)
1818.06.27Diocese of Carinola was suppressed (to Diocese of Sessa Aurunca)
1818.06.27Diocese of Castro was suppressed (to Metropolitan Archdiocese of Otranto)
1818.06.27Diocese of Cerenzia was suppressed (to Diocese of Cariati)
1818.06.27Diocese of Città Ducale was suppressed (to Diocese of L’Aquila)
1818.06.27Metropolitan Archdiocese of Cosenza was demoted as Archdiocese of Cosenza (without ecclesiastical province)
1818.06.27Diocese of Fondi was suppressed (to Diocese of Gaeta)
1818.06.27Diocese of Frigento was suppressed (to Diocese of Avellino)
1818.06.27Diocese of Giovinazzo was suppressed (to Diocese of Molfetta)
1818.06.27Diocese of Guardialfiera was suppressed (to Diocese of Termoli)
1818.06.27Diocese of Isola was suppressed (to Diocese of Crotone)
1818.06.27Diocese of Lavello was suppressed (to Diocese of Venosa)
1818.06.27Diocese of Lettere–Gragnano was suppressed (to Diocese of Castellammare di Stabia)
1818.06.27Diocese of Martirano was suppressed (to Diocese of Nicastro)
1818.06.27Diocese of Massa Lubrense was suppressed (to Metropolitan Archdiocese of Sorrento)
1818.06.27Archdiocese of Matera was suppressed (to Metropolitan Archdiocese of Acerenza)
1818.06.27Diocese of Minervino was suppressed (to Diocese of Andria)
1818.06.27Diocese of Minori was suppressed (to Archdiocese of Amalfi)
1818.06.27Diocese of Montecorvino was suppressed (to Diocese of Lucera)
1818.06.27Diocese of Montemarano was suppressed (to Diocese of Nusco)
1818.06.27Diocese of Monteverde was suppressed (to Metropolitan Archdiocese of Conza and Diocese of Sant’Angelo dei Lombardi)
1818.06.27Diocese of Mottola was suppressed (to Diocese of Castellaneta)
1818.06.27Metropolitan Archdiocese of Nazareth in Barletta was suppressed (to Metropolitan Archdiocese of Trani)
1818.06.27Diocese of Nocera de’ Pagani was suppressed (to Diocese of Cava)
1818.06.27Diocese of Ortona was suppressed (to Metropolitan Archdiocese of Lanciano)
1818.06.27Diocese of Ostuni was suppressed (to Metropolitan Archdiocese of Brindisi)
1818.06.27Diocese of Ravello was suppressed (to Archdiocese of Amalfi)
1818.06.27Diocese of Sarno was suppressed (to Diocese of Cava)
1818.06.27Diocese of Satriano was suppressed (to Metropolitan Archdiocese of Conza and Diocese of Campagna)
1818.06.27Diocese of Scala was suppressed (to Archdiocese of Amalfi)
1818.06.27Diocese of Strongoli was suppressed (to Diocese of Cariati)
1818.06.27Diocese of Terlizzi was suppressed (to Diocese of Molfetta)
1818.06.27Diocese of Trevico was suppressed (to Diocese of Lacedonia)
1818.06.27Diocese of Umbriatico was suppressed (to Diocese of Cariati)
1818.06.27Diocese of Venafro was suppressed (to Diocese of Isernia)
1818.06.27Diocese of Vulturara was suppressed (to Diocese of Lucera)
1818.06.28Diocese of Vico Equense was suppressed (to Metropolitan Archdiocese of Sorrento)
1818.07.27Diocese of Polignano was suppressed (to Diocese of Monopoli)
1818.09.12Abbacy nullius of Asola was suppressed (to Diocese of Brescia and Diocese of Mantova)
1819.01.18Diocese of Pergola was established (from Diocese of Cagli)
1819.03.09Diocese of Adria exchanged territory with Diocese of Padova
1819.03.09Diocese of Padova exchanged territory with Diocese of Adria
1819.06.14Archpresbyterate nullius of Cerignola was promoted as Diocese of Cerignola (became suffragan of Benevento)
1820.12.14Diocese of Alife was restored (from Diocese of Telese)
1821Diocese of Reggio Emilia lost territory to Diocese of Carpi
1821.05.14Diocese of Ostuni was restored (from Metropolitan Archdiocese of Brindisi and became suffragan of Brindisi)
1821.09.15Diocese of Norcia was restored (from Diocese of Spoleto and without ecclesiastical province)
1821.09.15Diocese of Spoleto was promoted as Archdiocese of Spoleto (lost territory to establish Diocese of Norcia)
1822Diocese of Carpi lost territory to Diocese of Modena
1822Diocese of Novara lost territory to Diocese of Sion
1822.02.18Diocese of Luni–Sarzana lost territory to Diocese of Massa Carrara
1822.02.18Abbacy nullius of Massa Carrara was promoted as Diocese of Massa Carrara (gained territory from Diocese of Luni–Sarzana and became suffragan of Pisa)
1822.07.03Archdiocese of Lucca lost territory to Diocese of Massa Carrara
1822.11.09Archdiocese of Matera was restored (from Metropolitan Archdiocese of Acerenza)
1824Metropolitan Archdiocese of Messina lost territory to Diocese of Patti
1824.11.08Diocese of Ogliastra was established (from Metropolitan Archdiocese of Cagliari and became suffragan of Cagliari)
1825Diocese of Agrigento lost territory to Metropolitan Archdiocese of Palermo
1825Diocese of Cefalù lost territory to Metropolitan Archdiocese of Palermo
1825.12.10Diocese of Civitavecchia was restored (from Diocese of Tuscanella)
1828.09.13Abbacy nullius of San Pietro Apostolo di Guastalla was promoted as Diocese of Guastalla (gained territory from Diocese of Parma and without ecclesiastical province)
1828.09.13Diocese of Parma lost territory to Diocese of Guastalla and Diocese of Reggio Emilia
1829Diocese of Novara exchanged territory with Diocese of Vigevano
1829Diocese of Vigevano exchanged territory with Diocese of Novara
1830.07.27Diocese of Gorizia e Gradisca was promoted as Metropolitan Archdiocese of Gorizia e Gradisca (with suffragan sees Koper, Krk, Ljubljana, Poreč i Pula and Trieste)
1831.06.20Diocese of Albenga lost territory to Diocese of Ventimiglia
1833.12.07Diocese of Nocera de’ Pagani was restored (from Diocese of Cava and became suffragan of Salerno)
1833.12.07Diocese of Sarno was restored (from Diocese of Cava and became suffragan of Salerno)
1834.02.19Diocese of Ortona was restored (from Metropolitan Archdiocese of Lanciano and became suffragan of Lanciano)
1834.11.19Provostry nullius of Atina was suppressed (to Territorial Abbacy of Montecassino)
1836.03.04Diocese of Giovinazzo was restored (from Diocese of Molfetta and without ecclesiastical province)
1836.03.04Diocese of Terlizzi was restored (from Diocese of Molfetta and without ecclesiastical province)
1838Territorial Abbacy of Montecassino lost territory to Diocese of San Marco
1839.08.26Diocese of Civita was renamed as Diocese of Civita–Tempio
1841.11.25Abbacy nullius of Farfa was suppressed (to Diocese of Rieti and to establish Diocese of Poggio Mirteto)
1841.11.25Diocese of Poggio Mirteto was established (from Diocese of Rieti and Diocese of Sabina and from the suppressed Abbacy nullius of Farfa and Abbacy nullius of San Salvatore Maggiore)
1841.11.25Diocese of Sabina lost territory to Diocese of Narni and Diocese of Tivoli
1841.11.25Abbacy nullius of San Salvatore Maggiore was suppressed (to Diocese of Rieti and to establish Diocese of Poggio Mirteto)
1844.01.11Diocese of Sovana was renamed as Diocese of Sovana–Pitigliano
1844.05.15Diocese of Noto was established (from Diocese of Siracusa)
1844.05.20Diocese of Agrigento lost territory to Metropolitan Archdiocese of Monreale
1844.05.20Diocese of Caltagirone exchanged territory with Diocese of Piazza Armerina
1844.05.20Diocese of Catania lost territory to Diocese of Caltagirone
1844.05.20Diocese of Cefalù exchanged territory with Metropolitan Archdiocese of Palermo and Diocese of Patti
1844.05.20Diocese of Mazara del Vallo lost territory to Metropolitan Archdiocese of Monreale
1844.05.20Diocese of Nicosia lost territory to Diocese of Patti and Diocese of Piazza Armerina
1844.05.20Metropolitan Archdiocese of Palermo exchanged territory with Diocese of Cefalù
1844.05.20Diocese of Patti exchanged territory with Diocese of Cefalù
1844.05.20Diocese of Piazza Armerina exchanged territory with Diocese of Caltagirone
1844.05.20Diocese of Siracusa was promoted as Metropolitan Archdiocese of Siracusa (with suffragan sees Caltagirone, Noto and Piazza Armerina and lost territory to Diocese of Piazza Armerina)
1844.05.25Diocese of Caltanissetta was established (from Diocese of Agrigento, Diocese of Cefalù and Diocese of Nicosia and became suffragan of Monreale)
1844.05.31Diocese of Trapani was established (from Diocese of Mazara del Vallo and became suffragan of Palermo)
1846Diocese of Agrigento lost territory to Metropolitan Archdiocese of Palermo
1846.04.30Diocese of Udine lost territory to Diocese of Belluno
1847.03.14Diocese of Udine was promoted as Metropolitan Archdiocese of Udine
1848Diocese of Albano lost territory to Diocese of Frascati
1848.08.17Territorial Prelature of Acquaviva delle Fonti was restored (from Metropolitan Archdiocese of Bari e Canosa and without ecclesiastical province)
1848.08.17Archpresbyterate nullius of Altamura was promoted as Territorial Prelature of Altamura (without ecclesiastical province)
1848.12.31Diocese of Gaeta was promoted as Archdiocese of Gaeta
1849.12.16Diocese of Caiazzo was restored (from Diocese of Caserta and became suffragan of Capua)
1850Diocese of Civita Castellana lost territory to Diocese of Viterbo
1850.07.07Diocese of Modigliana was established (from Diocese of Bertinoro, Diocese of Faenza, Diocese of Forlì and Diocese of Sarsina and became suffragan of Bologna)
1850.09.05Diocese of Sutri lost territory to Diocese of Civitavecchia
1850.09.21Diocese of Capaccio–Diano was renamed as Diocese of Capaccio (lost territory to establish Diocese of Diano–Teggiano)
1850.09.21Diocese of Diano–Teggiano was established (from Metropolitan Archdiocese of Salerno, Diocese of Capaccio–Diano and Diocese of Cava and became suffragan of Salerno)
1851.07.16Diocese of Capaccio was renamed as Diocese of Capaccio–Vallo
1852.06.19Diocese of Venafro was restored (from Diocese of Isernia and became suffragan of Capua)
1853.07.23Diocese of Vasto was established (from Metropolitan Archdiocese of Chieti)
1853.12.17Archdiocese of Lucca lost territory to Diocese of Massa Carrara
1854Diocese of Brugnato lost territory to Diocese of Massa Carrara
1854Diocese of Luni–Sarzana lost territory to Diocese of Massa Carrara
1854.11.30Diocese of Sant’Agata de’ Goti lost territory to Diocese of Acerra
1855Diocese of Luni–Sarzana lost territory to Diocese of Pontremoli
1855.05.29Abbacy nullius of San Pietro di Novalesa was suppressed (to Diocese of Susa)
1855.06.25Diocese of Foggia was established (from Metropolitan Archdiocese of Manfredonia and Diocese of Troia and without ecclesiastical province)
1855.08.01Diocese of Brugnato lost territory to Diocese of Pontremoli
1855.08.22Diocese of Modena was promoted as Metropolitan Archdiocese of Modena (with suffragan sees Borgo San Donnino, Carpi, Guastalla, Massa Carrara and Reggio Emilia)
1859.07Archdiocese of Spoleto lost territory to Diocese of Rieti
1859.09.04Diocese of Catania was promoted as Archdiocese of Catania (without ecclesiastical province)
1860.04.21Archdiocese of Barletta was restored (from Metropolitan Archdiocese of Trani and became suffragan of Trani)
1860.06.14Diocese of Ventimiglia lost territory to Diocese of Cuneo
1866Diocese of Reggio Emilia lost territory to Diocese of Guastalla
1866Abbacy nullius of Santissimo Salvatore (Italo-Albanese Rite) was suppressed (to Metropolitan Archdiocese of Messina)
1870.08.29Diocese of Como lost territory to Diocese of Chur
1871Abbacy nullius of San Giovanni in Venere was suppressed (to Metropolitan Archdiocese of Chieti)
1872Diocese of Mantova lost territory to Diocese of Carpi
1872Diocese of Corneto was renamed as Diocese of Tarquinia
1872.06.03Diocese of Acireale was established (from Metropolitan Archdiocese of Messina and Archdiocese of Catania and without ecclesiastical province)
1874.08.01Diocese of Asti lost territory to Diocese of Casale Monferrato
1874.08.01Metropolitan Archdiocese of Vercelli lost territory to Diocese of Casale Monferrato
1876.01.19Diocese of L’Aquila was promoted as Archdiocese of L’Aquila
1878Provostry nullius of Atina was restored (from Territorial Abbacy of Montecassino)
1882.03.27Diocese of Perugia was promoted as Archdiocese of Perugia (without ecclesiastical province)
1883.08.31Territorial Abbacy of Santissimo Salvatore (Italo-Albanese Rite) was restored
1885Titular Episcopal See of Sinita was renamed as Titular Episcopal See of Sinis
1886Diocese of Cuneo lost territory to Diocese of Ventimiglia
1886Diocese of Ventimiglia lost territory to Diocese of Nice
1892.08.14Abbacy nullius of Fontevivo was suppressed (to Diocese of Parma and united to Diocese of Parma)
1892.12.03Diocese of Chiavari was established (from Metropolitan Archdiocese of Genova and became suffragan of Genova)
1898Diocese of Cassano all’Jonio lost territory to Diocese of Policastro
1898Diocese of Montepeloso was renamed as Diocese of Irsina
1904.09.14Diocese of Ancona e Umana was promoted as Archdiocese of Ancona e Umana (without ecclesiastical province)
1908.03.25Diocese of Modigliana lost territory to Diocese of Sarsina
1910.08.05Abbacy nullius of San Michele Arcangelo di Montescaglioso was suppressed (to Metropolitan Archdiocese of Acerenza and united to Metropolitan Archdiocese of Acerenza)
1911Diocese of Tuscanella was renamed as Diocese of Tuscania
1914.03.04Diocese of Ariano lost territory to Diocese of Lucera
1914.05.05Diocese of Ostia–Velletri was renamed as Diocese of Ostia (lost territory to establish Diocese of Velletri)
1914.05.05Diocese of Velletri was restored (from Diocese of Ostia–Velletri and became suffragan of Roma)
1915.01.02Diocese of Nocera Umbra was renamed as Diocese of Nocera Umbra–Gualdo Tadino
1915.02.12Diocese of Bisarcio was suppressed (to establish Diocese of Ozieri)
1915.02.12Diocese of Ozieri was established (from the suppressed Diocese of Bisarcio and became suffragan of Sassari)
1916Metropolitan Archdiocese of Benevento lost territory to Diocese of Lucera
1916Diocese of Larino lost territory to Diocese of San Severo
1916.09Metropolitan Archdiocese of Firenze lost territory to Diocese of Prato
1916.09Diocese of Pistoia lost territory to Diocese of Prato
1919Diocese of Chioggia lost territory to Patriarchal See of Venezia
1919.02.13Diocese of Bisignano lost territory to Diocese of Lungro
1919.02.13Diocese of Cassano all’Jonio lost territory to Diocese of Lungro
1919.02.13Archdiocese of Cosenza lost territory to Diocese of Lungro
1919.02.13Ordinariate of Italia continentale (Italo-Albanese Rite) was promoted as Diocese of Lungro (gained territory from Archdiocese of Cosenza, Archdiocese of Rossano, Diocese of Bisignano, Diocese of Cassano all’Jonio and Diocese of San Marco and without ecclesiastical province)
1919.02.13Archdiocese of Rossano lost territory to Diocese of Lungro
1919.02.13Diocese of San Marco lost territory to Diocese of Lungro
1920.04.08Abbacy nullius of Santa Maria di Polsi was suppressed (to Diocese of Gerace and united to Diocese of Gerace)
1921.03.21Archdiocese of Gaeta lost territory to Diocese of Veroli
1921.09.30Metropolitan Archdiocese of Conza lost territory to Diocese of Campagna
1923.08.04Diocese of Bobbio was renamed as Diocese of Bobbio–San Colombano (gained territory from the suppressed Abbacy nullius of San Colombano)
1923.08.04Abbacy nullius of San Colombano was suppressed (to Diocese of Bobbio–San Colombano)
1923.11.13Metropolitan Archdiocese of Udine lost territory to Diocese of Concordia
1925.03.06Military Vicariate of Italy was established
1925.04.25Diocese of Trieste lost territory to Diocese of Rijeka–Opatija
1925.06.03Diocese of Poggio Mirteto was suppressed (to Diocese of Rieti and Diocese of Sabina e Poggio Mirteto)
1925.06.03Diocese of Sabina was renamed as Diocese of Sabina e Poggio Mirteto (gained territory from the suppressed Diocese of Poggio Mirteto)
1926Titular Episcopal See of Sinis was suppressed
1926.03.20Territorial Prelature of Beatissima Vergine Maria del Santissimo Rosario was established (from Diocese of Castellammare di Stabia and Diocese of Nola and became suffragan of Napoli)
1926.04.16Metropolitan Archdiocese of Udine lost territory to Diocese of Ceneda
1927.02.14Diocese of Treviso lost territory to Patriarchal See of Venezia
1927.06.05Diocese of Catanzaro was promoted as Archdiocese of Catanzaro
1927.06.29Diocese of Boiano was renamed as Diocese of Boiano–Campobasso
1927.09.22Diocese of Borgo San Donnino was renamed as Diocese of Fidenza
1928.01.27Diocese of Galtellì–Nuoro was suppressed (to establish Diocese of Nuoro)
1928.01.27Diocese of Nuoro was established (from the suppressed Diocese of Galtellì–Nuoro and became suffragan of Cagliari)
1929.01.12Diocese of La Spezia was established (from Diocese of Luni–Sarzana and became suffragan of Genova)
1929.06.14Diocese of Trento was promoted as Archdiocese of Trento
1934Diocese of Trieste lost territory to Diocese of Rijeka–Opatija
1934.09.15Diocese of Loreto was suppressed (to Diocese of Recanati–Loreto)
1934.09.15Diocese of Recanati was renamed as Diocese of Recanati–Loreto (gained territory from the suppressed Diocese of Loreto)
1935.05.08Diocese of Castellammare di Stabia lost territory to Territorial Prelature of Beatissima Vergine Maria del Santissimo Rosario
1935.05.08Diocese of Nola lost territory to Territorial Prelature of Beatissima Vergine Maria del Santissimo Rosario
1935.10.11Apostolic Administration of Loreto was restored (from Diocese of Recanati–Loreto)
1935.10.11Diocese of Recanati–Loreto was renamed as Diocese of Recanati (lost territory to establish Apostolic Administration of Loreto)
1937.06.05Diocese of Nocera Umbra–Gualdo Tadino lost territory to Diocese of Foligno
1937.09.26Territorial Abbacy of Santa Maria di Grottaferrata (Italo-Albanese Rite) was established
1937.10.26Metropolitan Archdiocese of Monreale lost territory to Diocese of Piana dei Greci
1937.10.26Metropolitan Archdiocese of Palermo lost territory to Diocese of Piana dei Greci
1937.10.26Ordinariate of Silicia (Italo-Albanese Rite) was promoted as Diocese of Piana dei Greci (gained territory from Metropolitan Archdiocese of Monreale and Metropolitan Archdiocese of Palermo and without ecclesiastical province)
1938Diocese of Larino lost territory to Metropolitan Archdiocese of Manfredonia
1938.12.31Diocese of Alghero lost territory to Diocese of Nuoro
1939.05.13Diocese of Ceneda was renamed as Diocese of Vittorio Veneto
1939.07.20Diocese of Massa Carrara was renamed as Diocese of Apuania
1941.10.25Diocese of Piana dei Greci (Italo-Albanese Rite) was renamed as Diocese of Piana degli Albanesi
1942.06.30Territorial Abbacy of San Paolo fuori le Mura lost territory to Diocese of Amelia
1943Diocese of Padova lost territory to Diocese of Feltre
1945.08.11Metropolitan Archdiocese of Acerenza lost territory to Archdiocese of Matera
1945.11.24Diocese of Capaccio–Vallo was renamed as Diocese of Vallo di Lucania
1946.01.05Diocese of Porto e Santa Rufina lost territory to Papal See of Roma
1947Metropolitan Archdiocese of Torino lost territory to Diocese of Gap and Diocese of Saint-Jean-de-Maurienne
1947Diocese of Ventimiglia lost territory to Diocese of Nice
1947.02.22Diocese of Cervia lost territory to Diocese of Comacchio
1947.05.10Diocese of Arezzo lost territory to Territorial Abbacy of Monte Oliveto Maggiore
1947.05.10Diocese of Pienza lost territory to Territorial Abbacy of Monte Oliveto Maggiore
1948.04.24Diocese of Fidenza exchanged territory with Diocese of Parma
1948.04.24Diocese of Parma exchanged territory with Diocese of Fidenza
1948.05.22Diocese of Ostia lost territory to Papal See of Roma
1949.05.14Diocese of Tricarico lost territory to Diocese of Anglona–Tursi
1949.07.01Metropolitan Archdiocese of Chieti lost territory to Diocese of Penne e Pescara
1949.07.01Diocese of Penne was renamed as Diocese of Penne e Pescara (gained territory from Metropolitan Archdiocese of Chieti and lost territory to Diocese of Teramo)
1950.01.19Diocese of Cuneo exchanged territory with Diocese of Mondovì
1950.01.19Diocese of Mondovì exchanged territory with Diocese of Cuneo
1950.01.24Diocese of Penne e Pescara lost territory to Diocese of Teramo
1950.03.19Diocese of Terracina exchanged territory with Diocese of Velletri
1950.03.19Diocese of Velletri exchanged territory with Diocese of Terracina
1950.07.11Diocese of Noto lost territory to Metropolitan Archdiocese of Siracusa
1950.07.11Diocese of Ragusa was established (from Metropolitan Archdiocese of Siracusa and Diocese of Noto and became suffragan of Siracusa)
1950.09.15Diocese of Mazara del Vallo exchanged territory with Diocese of Trapani
1950.09.15Diocese of Trapani exchanged territory with Diocese of Mazara del Vallo
1951.05.08Territorial Prelature of Beatissima Vergine Maria del Santissimo Rosario was renamed as Territorial Prelature of Pompei
1952.01.06Metropolitan Archdiocese of Santa Severina was demoted as Archdiocese of Santa Severina (without ecclesiastical province)
1954.02.22Diocese of Gerace was renamed as Diocese of Gerace–Locri
1954.04.05Diocese of Porto e Santa Rufina lost territory to Papal See of Roma
1954.07.02Archdiocese of Matera was promoted as Metropolitan Archdiocese of Matera (with suffragan sees Anglona–Tursi and Tricarico and gained title of San Michele Arcangelo di Montescaglioso)
1954.07.27Diocese of Volterra lost territory to Metropolitan Archdiocese of Siena
1954.11.16Diocese of Noto lost territory to Diocese of Ragusa
1955Metropolitan Archdiocese of Pisa lost territory to Archdiocese of Lucca
1955Diocese of Pontremoli lost territory to Diocese of Luni–Sarzana
1956.02.29Diocese of Veroli was renamed as Diocese of Veroli–Frosinone
1956.04.24Diocese of Ortona lost territory to Metropolitan Archdiocese of Lanciano
1957Diocese of Priverno lost territory to Diocese of Terracina
1957.07.09Diocese of Aversa exchanged territory with Diocese of Pozzuoli
1957.07.09Diocese of Pozzuoli exchanged territory with Diocese of Aversa
1959.07.18Diocese of Bova lost territory to Diocese of Gerace–Locri
1959.07.26Diocese of Apuania lost territory to Diocese of Brugnato and Diocese of Luni–Sarzana
1959.07.26Diocese of Brugnato exchanged territory with Diocese of Chiavari
1959.07.26Diocese of Chiavari lost territory to Diocese of Luni–Sarzana
1959.08.01Diocese of Ugento was renamed as Diocese of Ugento–Santa Maria di Leuca
1960.07.08Metropolitan Archdiocese of Palermo lost territory to Diocese of Piana degli Albanesi
1962.02.19Diocese of Città di Castello lost territory to Diocese of Arezzo
1963.12.16Diocese of Nicotera lost territory to Archdiocese of Cosenza
1963.12.31Diocese of Tropea lost territory to Archdiocese of Cosenza and Diocese of Nicastro
1964.07.06Diocese of Brixen was renamed as Diocese of Bolzano–Bressanone (gained territory from Archdiocese of Trento and lost territory to Diocese of Belluno)
1964.07.06Archdiocese of Trento was promoted as Metropolitan Archdiocese of Trento (lost territory to Diocese of Bolzano–Bressanone)
1965.02.02Diocese of Mondovì lost territory to Diocese of Albenga
1965.02.08Papal See of Roma lost territory to Diocese of Porto e Santa Rufina
1965.06.24Apostolic Administration of Loreto was promoted as Territorial Prelature of Loreto (gained territory from Diocese of Recanati)
1965.06.24Diocese of Recanati lost territory to Territorial Prelature of Loreto
1965.10.25Diocese of Ascoli Piceno lost territory to Diocese of Rieti
1965.11.17Diocese of Ascoli Piceno exchanged territory with Diocese of Teramo
1965.11.17Diocese of Teramo exchanged territory with Diocese of Ascoli Piceno
1966Titular Episcopal See of Amiterno was restored
1966Titular Episcopal See of Arpi was established
1966Titular Episcopal See of Blanda was restored
1966Titular Episcopal See of Canne was restored
1966Titular Episcopal See of Capo della Foresta was restored
1966Titular Episcopal See of Claterna was restored
1966Titular Episcopal See of Eclena was restored
1966Titular Episcopal See of Equilio was restored
1966Titular Episcopal See of Eraclea was restored
1966Titular Episcopal See of Faleri was restored
1966Titular Episcopal See of Fidene was restored
1966Titular Episcopal See of Forconio was restored
1966Titular Episcopal See of Foro Flaminii was restored
1966Titular Episcopal See of Gabi was restored
1966Titular Episcopal See of Lilibeo was restored
1966Titular Episcopal See of Malamocco was restored
1966Titular Episcopal See of Martana was established
1966Titular Episcopal See of Monterano was restored
1966Titular Episcopal See of Nomento was restored
1966Titular Episcopal See of Pausula was established
1966Titular Episcopal See of Pesto was restored
1966Titular Episcopal See of Plestia was restored
1966Titular Episcopal See of Roselle was restored
1966Titular Episcopal See of Sabiana was restored
1966Titular Episcopal See of Salpi was restored
1966Titular Episcopal See of Subaugusta was restored
1966Titular Episcopal See of Sulci was restored
1966Titular Episcopal See of Treba was restored
1966Titular Episcopal See of Tricala was restored
1966Titular Episcopal See of Tronto was restored
1966Titular Episcopal See of Velia was established
1966Titular Episcopal See of Voghenza was restored
1966Titular Episcopal See of Volturno was established
1967Titular Episcopal See of Eclena was renamed as Titular Episcopal See of Eclano
1967Titular Episcopal See of Sabiana was renamed as Titular Episcopal See of Sabiona
1967Titular Episcopal See of Zuglio was restored
1967.09.12Diocese of Terracina was renamed as Diocese of Terracina–Latina (gained territory from Diocese of Velletri)
1967.09.12Diocese of Velletri lost territory to Diocese of Terracina–Latina
1968Titular Episcopal See of Agropoli was restored
1968Titular Episcopal See of Alessano was restored
1968Titular Episcopal See of Altino was restored
1968Titular Episcopal See of Anzio was restored
1968Titular Episcopal See of Aquaviva was restored
1968Titular Metropolitan See of Aquileia was established (from former Patriarchal See of Aquileia)
1968Titular Episcopal See of Asolo was restored
1968Titular Episcopal See of Atella was restored
1968Titular Episcopal See of Belcastro was restored
1968Titular Episcopal See of Bettona was restored
1968Titular Episcopal See of Bevagna was restored
1968Titular Episcopal See of Bitetto was restored
1968Titular Episcopal See of Brescello was restored
1968Titular Episcopal See of Campli was restored
1968Titular Episcopal See of Caorle was restored
1968Titular Episcopal See of Capri was restored
1968Titular Episcopal See of Carini was restored
1968Titular Episcopal See of Carinola was restored
1968Titular Episcopal See of Castro was restored
1968Titular Episcopal See of Castro was restored
1968Titular Episcopal See of Castro was restored
1968Titular Episcopal See of Cerenzia was restored
1968Titular Episcopal See of Cerveteri was restored
1968Titular Episcopal See of Città Ducale was restored
1968Titular Episcopal See of Civitate was restored
1968Titular Episcopal See of Dolia was restored
1968Titular Episcopal See of Dragonara was restored
1968Titular Episcopal See of Fiorentino was restored
1968Titular Episcopal See of Fondi was restored
1968Titular Episcopal See of Forlimpopoli was restored (from Diocese of Bertinoro)
1968Titular Episcopal See of Formia was restored
1968Titular Episcopal See of Forum Traiani was restored
1968Titular Metropolitan See of Grado was established (from former Patriarchal See of Grado)
1968Titular Episcopal See of Guardialfiera was restored
1968Titular Episcopal See of Isola was restored
1968Titular Episcopal See of Labico was restored
1968Titular Episcopal See of Lavello was restored
1968Titular Episcopal See of Lentini was restored
1968Titular Episcopal See of Lesina was restored
1968Titular Episcopal See of Lettere was restored
1968Titular Episcopal See of Malamocco was suppressed
1968Titular Episcopal See of Martirano was restored
1968Titular Episcopal See of Massa Lubrense was restored
1968Titular Episcopal See of Minervino Murge was restored
1968Titular Episcopal See of Minori was restored
1968Titular Episcopal See of Minturno was restored
1968Titular Episcopal See of Montecorvino was restored
1968Titular Episcopal See of Montemarano was restored
1968Titular Episcopal See of Monteverde was restored
1968Titular Episcopal See of Mottola was restored
1968Titular Episcopal See of Oderzo was restored
1968Titular Episcopal See of Otricoli was restored
1968Titular Episcopal See of Passo Corese was restored
1968Titular Episcopal See of Ploaghe was restored
1968Titular Episcopal See of Polignano was restored
1968Titular Episcopal See of Potenza Picena was restored
1968Titular Episcopal See of Ravello was restored
1968Titular Episcopal See of Sala Consilina was restored
1968Titular Episcopal See of San Leone was restored
1968Titular Episcopal See of Santa Giusta was restored
1968Titular Episcopal See of Satriano was restored
1968Titular Episcopal See of Scala was restored
1968Titular Episcopal See of Sorres was restored
1968Titular Episcopal See of Spello was restored
1968Titular Episcopal See of Suelli was restored
1968Titular Episcopal See of Tauriano was restored
1968Titular Episcopal See of Termini Imerese was restored
1968Titular Episcopal See of Tindari was restored
1968Titular Episcopal See of Torcello was restored
1968Titular Episcopal See of Tortiboli was restored
1968Titular Episcopal See of Trevi was restored
1968Titular Episcopal See of Trevico was restored
1968Titular Episcopal See of Troina was restored
1968Titular Episcopal See of Urbisaglia was restored
1968Titular Episcopal See of Vescovìo was restored
1968Titular Episcopal See of Vibo Valentia was restored
1968Titular Episcopal See of Vico Equense was restored
1968Titular Episcopal See of Vulturara was restored
1969Titular Episcopal See of Bomarzo was restored
1969Titular Episcopal See of Castello was restored
1969Titular Episcopal See of Falerone was restored
1969Titular Episcopal See of Strongoli was restored
1969Titular Episcopal See of Taormina was restored
1969Titular Episcopal See of Umbriatico was restored
1970Titular Episcopal See of Blera was restored
1970Titular Episcopal See of Bolsena was restored
1970Titular Episcopal See of Buxentum was established
1970Titular Episcopal See of Caudium was restored
1970Titular Episcopal See of Civitanova was established
1970Titular Episcopal See of Cuma was restored
1970Titular Episcopal See of Ferento was restored
1970Titular Episcopal See of Frigento was restored
1970Titular Episcopal See of Galazia in Campania was restored
1970Titular Episcopal See of Grumentum was restored
1970Titular Episcopal See of Lorium was restored
1970Titular Episcopal See of Miseno was restored
1970Titular Episcopal See of Ofena was restored
1970Titular Episcopal See of Tharros was restored
1970Titular Episcopal See of Tre Taverne was restored
1970Titular Episcopal See of Trevi nel Lazio was established
1971Titular Episcopal See of Pesto was renamed as Titular Episcopal See of Pesto
1971.01.12Diocese of Concordia was renamed as Diocese of Concordia–Pordenone
1972Diocese of Larino lost territory to Diocese of San Severo
1972.08.15Archdiocese of Ancona e Umana was promoted as Metropolitan Archdiocese of Ancona e Umana (with suffragan sees Jesi and Osimo)
1972.08.15Archdiocese of L’Aquila was promoted as Metropolitan Archdiocese of L’Aquila (with suffragan sees Marsi and Sulmona)
1972.08.15Archdiocese of Perugia was promoted as Metropolitan Archdiocese of Perugia (with suffragan sees Assisi, Città della Pieve, Città di Castello, Foligno, Gubbio and Nocera Umbra–Gualdo Tadino)
1972.09.25Diocese of Cava was renamed as Diocese of Cava de’ Tirreni
1973Diocese of Città della Pieve lost territory to Diocese of Acquapendente and Diocese of Chiusi
1973Diocese of Civita Castellana lost territory to Diocese of Bagnoregio
1973.01.05Diocese of Anglona–Tursi exchanged territory with Diocese of Cassano all’Jonio
1973.01.05Diocese of Cassano all’Jonio exchanged territory with Diocese of Anglona–Tursi
1973.02.11Diocese of Boiano–Campobasso was promoted as Archdiocese of Boiano–Campobasso (without ecclesiastical province)
1973.02.11Diocese of Potenza was promoted as Archdiocese of Potenza (without ecclesiastical province)
1973.03.24Diocese of Bagnoregio lost territory to Diocese of Orvieto
1973.03.24Diocese of Orvieto lost territory to Diocese of Acquapendente
1973.03.31Diocese of Campagna lost territory to Archdiocese of Potenza
1973.03.31Diocese of Muro Lucano lost territory to Diocese of Campagna
1973.11.21Diocese of Nicastro lost territory to Archdiocese of Cosenza
1973.11.22Archdiocese of Cosenza lost territory to Diocese of Lungro
1973.12.01Diocese of Albenga was renamed as Diocese of Albenga–Imperia
1974Titular Episcopal See of Buxentum was suppressed
1974Titular Episcopal See of Eca was restored
1974.10.18Metropolitan Archdiocese of Udine lost territory to Diocese of Concordia–Pordenone
1975Titular Episcopal See of Forum Traiani was renamed as Titular Episcopal See of Fordongianus
1975Titular Episcopal See of Numana was restored
1975.07.03Diocese of Ventimiglia was renamed as Diocese of Ventimiglia–San Remo
1975.07.05Metropolitan Archdiocese of Ancona e Umana was renamed as Metropolitan Archdiocese of Ancona
1975.08.04Diocese of Luni–Sarzana was suppressed (to Diocese of La Spezia and to establish Diocese of Sarzana)
1975.08.04Diocese of Sarzana was established (from the suppressed Diocese of Luni–Sarzana)
1975.10.07Diocese of Arezzo lost territory to Metropolitan Archdiocese of Siena
1975.10.07Diocese of Pistoia lost territory to Diocese of Prato
1975.10.07Diocese of Sansepolcro lost territory to Diocese of Cesena and Diocese of Forlì
1975.10.07Diocese of Sovana–Pitigliano lost territory to Diocese of Grosseto
1976Titular Episcopal See of Castro was renamed as Titular Episcopal See of Castro di Puglia
1976Titular Episcopal See of Castro was renamed as Titular Episcopal See of Castro di Sardegna
1976.06.21Metropolitan Archdiocese of L’Aquila exchanged territory with Diocese of Rieti
1976.06.21Diocese of Narni lost territory to Diocese of Rieti
1976.06.21Diocese of Norcia lost territory to Diocese of Rieti
1976.06.21Diocese of Rieti exchanged territory with Metropolitan Archdiocese of L’Aquila
1976.06.21Archdiocese of Spoleto lost territory to Diocese of Rieti
1976.08.21Metropolitan Archdiocese of Acerenza was demoted as Diocese of Acerenza (became suffragan of Potenza)
1976.08.21Diocese of Andria lost territory to Diocese of Venosa
1976.08.21Archdiocese of Boiano–Campobasso was promoted as Metropolitan Archdiocese of Boiano–Campobasso (with suffragan sees Isernia, Termoli, Trivento and Venafro)
1976.08.21Metropolitan Archdiocese of Matera was demoted as Diocese of Matera (lost territory to Diocese of Castellaneta and became suffragan of Potenza)
1976.08.21Archdiocese of Potenza was promoted as Metropolitan Archdiocese of Potenza (with suffragan sees Acerenza, Anglona–Tursi, Marsico Nuovo, Matera, Melfi, Muro Lucano, Rapolla, Tricarico and Venosa)
1976.08.21Diocese of Venosa lost territory to Diocese of Gravina
1976.09.08Diocese of Acerenza lost territory to Metropolitan Archdiocese of Potenza
1976.09.08Diocese of Anglona–Tursi was suppressed (to Diocese of Cassano all’Jonio and to establish Diocese of Tursi–Lagonegro)
1976.09.08Metropolitan Archdiocese of Conza lost territory to Diocese of Melfi
1976.09.08Diocese of Matera lost territory to Diocese of Castellaneta
1976.09.08Diocese of Muro Lucano lost territory to Diocese of Melfi
1976.09.08Diocese of Rapolla lost territory to Metropolitan Archdiocese of Potenza
1976.09.08Territorial Abbacy of Santissima Trinità di Cava de’ Tirreni lost territory to Metropolitan Archdiocese of Potenza
1976.09.08Diocese of Tricarico lost territory to Diocese of Matera
1976.09.08Diocese of Tursi–Lagonegro was restored (from Metropolitan Archdiocese of Potenza, Diocese of Cassano all’Jonio, Diocese of Diano–Teggiano, Diocese of Matera and Diocese of Policastro, from the suppressed Diocese of Anglona–Tursi and became suffragan of Potenza)
1976.12.08Metropolitan Archdiocese of Ferrara was demoted as Archdiocese of Ferrara (became suffragan of Bologna)
1977.01.01Metropolitan Archdiocese of Genova lost territory to Diocese of Livorno
1977.02.22Diocese of Rimini exchanged territory with Diocese of Montefeltro
1977.02.22Diocese of Montefeltro was renamed as Diocese of San Marino–Montefeltro (lost territory to Diocese of Sarsina, exchanged territory with Diocese of Rimini and became suffragan of Ravenna)
1977.03.21Provostry nullius of Atina was suppressed (to Territorial Abbacy of Montecassino)
1977.03.21Territorial Abbacy of Montecassino lost territory to Metropolitan Archdiocese of Chieti, Diocese of Aquino, Diocese of Isernia, Diocese of Penne e Pescara, Diocese of Sessa Aurunca, Diocese of Sulmona, Diocese of Teano, Diocese of Trivento, Diocese of Valva and Diocese of Venafro
1977.10.17Metropolitan Archdiocese of Gorizia e Gradisca lost territory to Diocese of Koper
1977.10.17Diocese of Trieste was renamed as Diocese of Trieste (lost territory to Diocese of Poreč i Pula and exchanged territory with Diocese of Koper)
1977.10.17Diocese of Trivento lost territory to Diocese of Sulmona
1977.10.28Diocese of Città della Pieve lost territory to Diocese of Sovana–Pitigliano
1977.10.28Diocese of Montalcino lost territory to Diocese of Pienza
1977.10.28Diocese of Pienza lost territory to Territorial Abbacy of Monte Oliveto Maggiore
1977.10.28Metropolitan Archdiocese of Siena lost territory to Diocese of Montalcino
1977.11.15Diocese of Ariano exchanged territory with Diocese of Bovino
1977.11.15Diocese of Bovino exchanged territory with Diocese of Ariano
1977.11.28Diocese of Acerenza was promoted as Archdiocese of Acerenza
1977.12.03Diocese of Matera was promoted as Archdiocese of Matera (lost territory to Diocese of Castellaneta)
1978Diocese of Ascoli Satriano exchanged territory with Diocese of Bovino
1978Diocese of Bovino exchanged territory with Diocese of Ascoli Satriano
1978Archdiocese of Cosenza lost territory to Diocese of Lungro
1978.05.14Diocese of Massa Marittima e Populonia was renamed as Diocese of Massa Marittima–Piombino
1978.05.14Titular Episcopal See of Populonia was restored
1978.05.23Metropolitan Archdiocese of Milano (Ambrosian Rite) lost territory to Diocese of Lodi
1978.11.21Diocese of Arezzo lost territory to Metropolitan Archdiocese of Siena
1979.01.15Metropolitan Archdiocese of Milano (Ambrosian Rite) lost territory to Diocese of Pavia
1979.01.21Diocese of Lodi exchanged territory with Diocese of Pavia
1979.01.21Diocese of Pavia exchanged territory with Diocese of Lodi
1979.04.04Diocese of Cariati lost territory to Diocese of Crotone
1979.04.04Diocese of Cassano all’Jonio lost territory to Diocese of San Marco Argentano–Scalea
1979.04.04Diocese of Crotone lost territory to Archdiocese of Santa Severina
1979.04.04Diocese of San Marco was renamed as Diocese of San Marco Argentano–Scalea (gained territory from Diocese of Cassano all’Jonio and lost territory to Archdiocese of Cosenza)
1979.04.30Metropolitan Archdiocese of Capua was demoted as Archdiocese of Capua (became suffragan of Napoli)
1979.04.30Metropolitan Archdiocese of Conza was demoted as Archdiocese of Conza (became suffragan of Benevento)
1979.04.30Diocese of Foggia was promoted as Metropolitan Archdiocese of Foggia (with suffragan sees Manfredonia, Ascoli Satriano, Cerignola, Lucera, San Severo, Troia and Vieste)
1979.04.30Metropolitan Archdiocese of Manfredonia was demoted as Archdiocese of Manfredonia (became suffragan of Foggia)
1979.04.30Metropolitan Archdiocese of Sorrento was demoted as Archdiocese of Sorrento (became suffragan of Napoli)
1979.06.10Diocese of Mileto lost territory to Metropolitan Archdiocese of Reggio Calabria and Diocese of Oppido Mamertina–Palmi
1979.06.10Diocese of Oppido Mamertina was renamed as Diocese of Oppido Mamertina–Palmi (gained territory from Diocese of Mileto)
1979.10.15Diocese of Avellino exchanged territory with Territorial Abbacy of Montevergine
1979.10.15Diocese of Cava de’ Tirreni lost territory to Territorial Abbacy of Santissima Trinità di Cava de’ Tirreni
1979.10.15Territorial Abbacy of Montevergine exchanged territory with Diocese of Avellino
1979.10.15Diocese of Nocera de’ Pagani exchanged territory with Territorial Abbacy of Santissima Trinità di Cava de’ Tirreni
1979.10.15Metropolitan Archdiocese of Salerno lost territory to Diocese of Nocera de’ Pagani
1979.10.15Territorial Abbacy of Santissima Trinità di Cava de’ Tirreni lost territory to Diocese of Diano–Teggiano and Diocese of Vallo di Lucania
1980.01.20Diocese of Oppido Mamertina–Palmi lost territory to Metropolitan Archdiocese of Reggio Calabria
1980.04.14Diocese of Assisi lost territory to Archdiocese of Spoleto
1980.10.20Metropolitan Archdiocese of Brindisi was demoted as Archdiocese of Brindisi (became suffragan of Lecce)
1980.10.20Diocese of Lecce was promoted as Metropolitan Archdiocese of Lecce (with suffragan sees Brindisi, Otranto, Gallipoli, Nardò, Ostuni and Ugento–Santa Maria di Leuca)
1980.10.20Metropolitan Archdiocese of Otranto was demoted as Archdiocese of Otranto (became suffragan of Lecce)
1980.10.20Metropolitan Archdiocese of Trani was demoted as Archdiocese of Trani (became suffragan of Bari e Canosa)
1981Territorial Abbacy of San Paolo fuori le Mura lost territory to Papal See of Roma
1981.03.25Abbacy nullius of Santi Vincenzo ed Anastasio alle Tre Fontane was suppressed (to Papal See of Roma, Diocese of Civita Castellana, Diocese of Nepi and Diocese of Sovana–Pitigliano–Orbetello)
1981.03.25Diocese of Sovana–Pitigliano was renamed as Diocese of Sovana–Pitigliano–Orbetello (gained territory from the suppressed Abbacy nullius of Santi Vincenzo ed Anastasio alle Tre Fontane)
1982Titular Episcopal See of Trevi nel Lazio was suppressed
1982.02.27Metropolitan Archdiocese of Boiano–Campobasso was renamed as Metropolitan Archdiocese of Campobasso–Boiano
1982.03.02Metropolitan Archdiocese of Lanciano was demoted as Archdiocese of Lanciano (became suffragan of Chieti)
1982.03.02Diocese of Penne e Pescara was promoted as Metropolitan Archdiocese of Pescara–Penne (with suffragan sees Atri and Teramo)
1982.11.28Personal Prelature of Opus Dei was established (depended on Sacred Congregation for Bishops)
1983.01.21Metropolitan Archdiocese of Benevento exchanged territory with Metropolitan Archdiocese of Campobasso–Boiano
1983.01.21Metropolitan Archdiocese of Campobasso–Boiano exchanged territory with Metropolitan Archdiocese of Benevento
1983.01.21Diocese of Lucera lost territory to Metropolitan Archdiocese of Benevento
1983.03.21Territorial Abbacy of San Paolo fuori le Mura lost territory to Diocese of Nepi
1983.04.07Diocese of Ripatransone was renamed as Diocese of Ripatransone–San Benedetto del Tronto
1983.05.25Diocese of Lacedonia lost territory to Diocese of Ascoli Satriano
1984.03.19Archdiocese of Camerino lost territory to Diocese of Cingoli and Diocese of Fabriano
1984.03.19Diocese of Città di Castello lost territory to Diocese of Cagli and Diocese of Cortona
1984.03.19Diocese of Macerata exchanged territory with Diocese of Osimo
1984.03.19Diocese of Nocera Umbra–Gualdo Tadino lost territory to Archdiocese of Camerino, Diocese of Fabriano, Diocese of Foligno, Diocese of Pergola and Diocese of Senigallia
1984.03.19Diocese of Norcia lost territory to Archdiocese of Camerino
1984.03.19Diocese of Osimo exchanged territory with Diocese of Macerata and Diocese of Recanati
1984.03.19Diocese of Recanati exchanged territory with Diocese of Osimo
1984.09.15Metropolitan Archdiocese of Modena lost territory to Diocese of Reggio Emilia
1986.02.11Diocese of Gallese was suppressed (to Diocese of Civita Castellana)
1986.02.11Diocese of Nepi was suppressed (to Diocese of Civita Castellana)
1986.02.11Diocese of Orte was suppressed (to Diocese of Civita Castellana)
1986.02.11Diocese of Sutri was suppressed (to Diocese of Civita Castellana)
1986.03.27Diocese of Montefiascone was suppressed (to Diocese of Viterbo)
1986.03.27Abbacy nullius of San Martino al Monte Cimino was suppressed (to Diocese of Viterbo and united to Diocese of Viterbo)
1986.03.27Diocese of Tuscania was suppressed (to Diocese of Viterbo)
1986.07.21Military Vicariate of Italy was promoted as Military Ordinariate of Ordinariato Militare per l’Italia
1986.09.30Diocese of Acerno was suppressed (to Metropolitan Archdiocese of Salerno–Campagna–Acerno)
1986.09.30Diocese of Acquapendente was suppressed (to Diocese of Viterbo, Acquapendente, Bagnoregio, Montefiascone, Tuscania e San Martino al Monte Cimino)
1986.09.30Territorial Prelature of Acquaviva delle Fonti was suppressed (to Diocese of Altamura–Gravina–Acquaviva delle Fonti)
1986.09.30Diocese of Adria was renamed as Diocese of Adria–Rovigo
1986.09.30Diocese of Alatri was suppressed (to Diocese of Anagni–Alatri)
1986.09.30Diocese of Ales was renamed as Diocese of Ales–Terralba (gained territory from the suppressed Diocese of Terralba)
1986.09.30Diocese of Alghero was renamed as Diocese of Alghero–Bosa (gained territory from the suppressed Diocese of Bosa)
1986.09.30Diocese of Alife was renamed as Diocese of Alife–Caiazzo (gained territory from the suppressed Diocese of Caiazzo)
1986.09.30Territorial Prelature of Altamura was promoted as Diocese of Altamura–Gravina–Acquaviva delle Fonti (gained territory from Metropolitan Archdiocese of Bari e Canosa and gained territory from the suppressed Diocese of Gravina and Territorial Prelature of Acquaviva delle Fonti)
1986.09.30Archdiocese of Amalfi was renamed as Archdiocese of Amalfi–Cava de’ Tirreni (gained territory from the suppressed Diocese of Cava de’ Tirreni)
1986.09.30Diocese of Amelia was suppressed (to Diocese of Terni–Narni–Amelia)
1986.09.30Diocese of Ampurias was suppressed (to establish Diocese of Tempio–Ampurias)
1986.09.30Diocese of Anagni was renamed as Diocese of Anagni–Alatri (gained territory from the suppressed Diocese of Alatri)
1986.09.30Metropolitan Archdiocese of Ancona was renamed as Metropolitan Archdiocese of Ancona–Osimo (gained territory from the suppressed Diocese of Osimo and lost suffragan see Osimo)
1986.09.30Diocese of Aquino was suppressed (to Diocese of Sora–Aquino–Pontecorvo)
1986.09.30Diocese of Arezzo was renamed as Diocese of Arezzo–Cortona–Sansepolcro (gained territory from Diocese of Montepulciano, gained territory from the suppressed Diocese of Cortona and Diocese of Sansepolcro and became suffragan of Firenze)
1986.09.30Diocese of Ariano was renamed as Diocese of Ariano Irpino–Lacedonia (gained territory from the suppressed Diocese of Lacedonia)
1986.09.30Diocese of Ascoli Satriano was suppressed (to Diocese of Cerignola–Ascoli Satriano)
1986.09.30Diocese of Assisi was renamed as Diocese of Assisi–Nocera Umbra–Gualdo Tadino (gained territory from the suppressed Diocese of Nocera Umbra–Gualdo Tadino)
1986.09.30Diocese of Atri was suppressed (to Diocese of Teramo–Atri)
1986.09.30Diocese of Marsi was renamed as Diocese of Avezzano
1986.09.30Diocese of Bagnoregio was suppressed (to Diocese of Viterbo, Acquapendente, Bagnoregio, Montefiascone, Tuscania e San Martino al Monte Cimino)
1986.09.30Metropolitan Archdiocese of Bari e Canosa was renamed as Metropolitan Archdiocese of Bari–Bitonto (gained territory from the suppressed Diocese of Bitonto, lost territory to Diocese of Altamura–Gravina–Acquaviva delle Fonti and lost suffragan sees Barletta, Bisceglie, Bitonto, Giovinazzo, Monopoli, Ruvo and Terlizzi)
1986.09.30Archdiocese of Barletta was suppressed (to Archdiocese of Trani–Barletta–Bisceglie)
1986.09.30Diocese of Belluno was renamed as Diocese of Belluno–Feltre (gained territory from the suppressed Diocese of Feltre)
1986.09.30Diocese of Bertinoro was suppressed (to Diocese of Forlì–Bertinoro)
1986.09.30Diocese of Bisaccia was suppressed (to Archdiocese of Sant’Angelo dei Lombardi–Conza–Nusco–Bisaccia)
1986.09.30Diocese of Bisceglie was suppressed (to Archdiocese of Trani–Barletta–Bisceglie)
1986.09.30Diocese of Bisignano was suppressed (to Archdiocese of Cosenza–Bisignano)
1986.09.30Diocese of Bitonto was suppressed (to Metropolitan Archdiocese of Bari–Bitonto)
1986.09.30Diocese of Bobbio–San Colombano was suppressed (to Metropolitan Archdiocese of Genova–Bobbio)
1986.09.30Diocese of Bosa was suppressed (to Diocese of Alghero–Bosa)
1986.09.30Diocese of Bova was suppressed (to Metropolitan Archdiocese of Reggio Calabria–Bova)
1986.09.30Diocese of Bovino was suppressed (to Metropolitan Archdiocese of Foggia–Bovino)
1986.09.30Archdiocese of Brindisi was renamed as Archdiocese of Brindisi–Ostuni (gained territory from the suppressed Diocese of Ostuni)
1986.09.30Diocese of Brugnato was suppressed (to Diocese of La Spezia–Sarzana–Brugnato)
1986.09.30Diocese of Cagli was suppressed (to Diocese of Fano–Fossombrone–Cagli–Pergola)
1986.09.30Diocese of Caiazzo was suppressed (to Diocese of Alife–Caiazzo)
1986.09.30Diocese of Calvi was suppressed (to Diocese of Teano–Calvi)
1986.09.30Archdiocese of Camerino was renamed as Archdiocese of Camerino–San Severino Marche (gained territory from the suppressed Diocese of San Severino and became suffragan of Fermo)
1986.09.30Diocese of Campagna was suppressed (to Metropolitan Archdiocese of Salerno–Campagna–Acerno)
1986.09.30Diocese of Cariati was suppressed (to Archdiocese of Rossano–Cariati)
1986.09.30Diocese of Castellammare di Stabia was suppressed (to Archdiocese of Sorrento–Castellammare di Stabia)
1986.09.30Archdiocese of Catanzaro was renamed as Archdiocese of Catanzaro–Squillace (gained territory from Diocese of Nicastro and gained territory from the suppressed Diocese of Squillace)
1986.09.30Diocese of Cava de’ Tirreni was suppressed (to Archdiocese of Amalfi–Cava de’ Tirreni)
1986.09.30Diocese of Cerignola was renamed as Diocese of Cerignola–Ascoli Satriano (gained territory from the suppressed Diocese of Ascoli Satriano)
1986.09.30Diocese of Telese was renamed as Diocese of Cerreto Sannita–Telese–Sant’Agata de’ Goti (gained territory from the suppressed Diocese of Sant’Agata de’ Goti)
1986.09.30Diocese of Cervia was suppressed (to Metropolitan Archdiocese of Ravenna–Cervia)
1986.09.30Diocese of Cesena was renamed as Diocese of Cesena–Sarsina (gained territory from the suppressed Diocese of Sarsina)
1986.09.30Metropolitan Archdiocese of Chieti was renamed as Metropolitan Archdiocese of Chieti–Vasto (gained territory from the suppressed Diocese of Vasto and lost suffragan see Ortona)
1986.09.30Diocese of Chiusi was suppressed (to Diocese of Montepulciano–Chiusi–Pienza)
1986.09.30Diocese of Cingoli was suppressed (to Diocese of Macerata–Tolentino–Recanati–Cingoli–Treia)
1986.09.30Diocese of Città della Pieve was suppressed (to Metropolitan Archdiocese of Perugia–Città della Pieve)
1986.09.30Diocese of Civitavecchia was renamed as Diocese of Civitavecchia–Tarquinia (gained territory from the suppressed Diocese of Tarquinia)
1986.09.30Diocese of Civita–Tempio was suppressed (to establish Diocese of Tempio–Ampurias)
1986.09.30Diocese of Colle di Val d’Elsa was suppressed (to Metropolitan Archdiocese of Siena–Colle di Val d’Elsa–Montalcino)
1986.09.30Diocese of Comacchio was suppressed (to Archdiocese of Ferrara–Comacchio and lost title of Pomposa)
1986.09.30Diocese of Conversano was renamed as Diocese of Conversano–Monopoli (gained territory from the suppressed Diocese of Monopoli)
1986.09.30Archdiocese of Conza was suppressed (to Archdiocese of Sant’Angelo dei Lombardi–Conza–Nusco–Bisaccia)
1986.09.30Diocese of Cortona was suppressed (to Diocese of Arezzo–Cortona–Sansepolcro)
1986.09.30Archdiocese of Cosenza was renamed as Archdiocese of Cosenza–Bisignano (gained territory from Diocese of Nicastro and gained territory from the suppressed Diocese of Bisignano)
1986.09.30Diocese of Crotone was promoted as Archdiocese of Crotone–Santa Severina (gained territory from the suppressed Archdiocese of Santa Severina)
1986.09.30Diocese of Fabriano was renamed as Diocese of Fabriano–Matelica (gained territory from the suppressed Diocese of Matelica)
1986.09.30Diocese of Faenza was renamed as Diocese of Faenza–Modigliana (gained territory from the suppressed Diocese of Modigliana)
1986.09.30Diocese of Fano was renamed as Diocese of Fano–Fossombrone–Cagli–Pergola (gained territory from the suppressed Diocese of Cagli, Diocese of Fossombrone and Diocese of Pergola and became suffragan of Urbino–Urbania–Sant’Angelo in Vado)
1986.09.30Diocese of Feltre was suppressed (to Diocese of Belluno–Feltre)
1986.09.30Diocese of Ferentino was suppressed (to Diocese of Frosinone–Veroli–Ferentino)
1986.09.30Archdiocese of Ferrara was renamed as Archdiocese of Ferrara–Comacchio (gained territory from the suppressed Diocese of Comacchio and gained title of Pomposa)
1986.09.30Metropolitan Archdiocese of Foggia was renamed as Metropolitan Archdiocese of Foggia–Bovino (gained territory from Archdiocese of Manfredonia, gained territory from the suppressed Diocese of Bovino and lost suffragan sees Ascoli Satriano, Troia and Vieste)
1986.09.30Diocese of Forlì was renamed as Diocese of Forlì–Bertinoro (gained territory from the suppressed Diocese of Bertinoro and Diocese of Modigliana)
1986.09.30Diocese of Fossombrone was suppressed (to Diocese of Fano–Fossombrone–Cagli–Pergola)
1986.09.30Diocese of Veroli–Frosinone was renamed as Diocese of Frosinone–Veroli–Ferentino (gained territory from the suppressed Diocese of Ferentino)
1986.09.30Diocese of Gallipoli was suppressed (to Diocese of Nardò–Gallipoli)
1986.09.30Metropolitan Archdiocese of Genova was renamed as Metropolitan Archdiocese of Genova–Bobbio (gained territory from the suppressed Diocese of Bobbio–San Colombano and lost suffragan sees Bobbio–San Colombano, Brugnato and Noli)
1986.09.30Diocese of Giovinazzo was suppressed (to Diocese of Molfetta–Ruvo–Giovinazzo–Terlizzi)
1986.09.30Metropolitan Archdiocese of Gorizia e Gradisca was renamed as Metropolitan Archdiocese of Gorizia (lost territory to establish Titular Archiepiscopal See of Gradisca)
1986.09.30Titular Archiepiscopal See of Gradisca was restored (from Metropolitan Archdiocese of Gorizia e Gradisca)
1986.09.30Diocese of Gravina was suppressed (to Diocese of Altamura–Gravina–Acquaviva delle Fonti)
1986.09.30Diocese of Guastalla was suppressed (to Diocese of Reggio Emilia–Guastalla)
1986.09.30Diocese of Irsina was suppressed (to Archdiocese of Matera–Irsina)
1986.09.30Diocese of Isernia was renamed as Diocese of Isernia–Venafro (gained territory from the suppressed Diocese of Venafro)
1986.09.30Diocese of La Spezia was renamed as Diocese of La Spezia–Sarzana–Brugnato (gained territory from the suppressed Diocese of Brugnato and Diocese of Sarzana)
1986.09.30Diocese of Lacedonia was suppressed (to Diocese of Ariano Irpino–Lacedonia)
1986.09.30Diocese of Nicastro was renamed as Diocese of Lamezia Terme (lost territory to Archdiocese of Catanzaro–Squillace, Archdiocese of Cosenza–Bisignano and Diocese of Mileto–Nicotera–Tropea)
1986.09.30Archdiocese of Lanciano was renamed as Archdiocese of Lanciano–Ortona (gained territory from the suppressed Diocese of Ortona)
1986.09.30Diocese of Ogliastra was renamed as Diocese of Lanusei
1986.09.30Diocese of Larino was suppressed (to Diocese of Termoli–Larino)
1986.09.30Diocese of Terracina–Latina was renamed as Diocese of Latina–Terracina–Sezze–Priverno (gained territory from the suppressed Diocese of Priverno and Diocese of Sezze)
1986.09.30Diocese of Lipari was suppressed (to Metropolitan Archdiocese of Messina–Lipari–Santa Lucia del Mela)
1986.09.30Diocese of Gerace–Locri was renamed as Diocese of Locri–Gerace
1986.09.30Diocese of Lucera was renamed as Diocese of Lucera–Troia (gained territory from the suppressed Diocese of Troia and lost territory to Diocese of San Severo)
1986.09.30Diocese of Macerata was renamed as Diocese of Macerata–Tolentino–Recanati–Cingoli–Treia (gained territory from the suppressed Diocese of Cingoli, Diocese of Recanati, Diocese of Tolentino and Diocese of Treia)
1986.09.30Archdiocese of Manfredonia was renamed as Archdiocese of Manfredonia–Vieste (gained territory from the suppressed Diocese of Vieste and lost territory to Metropolitan Archdiocese of Foggia–Bovino and Diocese of San Severo)
1986.09.30Diocese of Marsico Nuovo was suppressed (to Metropolitan Archdiocese of Potenza–Muro Lucano–Marsico Nuovo)
1986.09.30Diocese of Apuania was renamed as Diocese of Massa
1986.09.30Diocese of Matelica was suppressed (to Diocese of Fabriano–Matelica)
1986.09.30Archdiocese of Matera was renamed as Archdiocese of Matera–Irsina (gained territory from the suppressed Diocese of Irsina)
1986.09.30Diocese of Melfi was renamed as Diocese of Melfi–Rapolla–Venosa (gained territory from the suppressed Diocese of Rapolla and Diocese of Venosa)
1986.09.30Metropolitan Archdiocese of Messina was renamed as Metropolitan Archdiocese of Messina–Lipari–Santa Lucia del Mela (gained territory from the suppressed Diocese of Lipari, Territorial Prelature of Santa Lucia del Mela and Territorial Abbacy of Santissimo Salvatore and gained title of Santissimo Salvatore)
1986.09.30Diocese of Mileto was renamed as Diocese of Mileto–Nicotera–Tropea (gained territory from Diocese of Nicastro, gained territory from the suppressed Diocese of Nicotera and Diocese of Tropea, lost territory to Diocese of Oppido Mamertina–Palmi and became suffragan of Reggio Calabria–Bova)
1986.09.30Metropolitan Archdiocese of Modena was renamed as Metropolitan Archdiocese of Modena–Nonantola (gained territory from the suppressed Abbacy nullius of Nonantola, lost title of Nonantola and lost suffragan sees Guastalla and Nonantola)
1986.09.30Diocese of Modigliana was suppressed (to Diocese of Faenza–Modigliana and Diocese of Forlì–Bertinoro)
1986.09.30Diocese of Molfetta was renamed as Diocese of Molfetta–Ruvo–Giovinazzo–Terlizzi (gained territory from the suppressed Diocese of Giovinazzo, Diocese of Ruvo and Diocese of Terlizzi)
1986.09.30Diocese of Monopoli was suppressed (to Diocese of Conversano–Monopoli)
1986.09.30Diocese of Montalcino was suppressed (to Metropolitan Archdiocese of Siena–Colle di Val d’Elsa–Montalcino)
1986.09.30Diocese of Montalto was suppressed (to Diocese of San Benedetto del Tronto–Ripatransone–Montalto)
1986.09.30Diocese of Montepulciano was renamed as Diocese of Montepulciano–Chiusi–Pienza (gained territory from the suppressed Diocese of Chiusi and Diocese of Pienza, lost territory to Diocese of Arezzo–Cortona–Sansepolcro and became suffragan of Siena–Colle di Val d’Elsa–Montalcino)
1986.09.30Diocese of Muro Lucano was suppressed (to Metropolitan Archdiocese of Potenza–Muro Lucano–Marsico Nuovo)
1986.09.30Diocese of Nardò was renamed as Diocese of Nardò–Gallipoli (gained territory from the suppressed Diocese of Gallipoli)
1986.09.30Diocese of Narni was suppressed (to Diocese of Terni–Narni–Amelia)
1986.09.30Diocese of Nicotera was suppressed (to Diocese of Mileto–Nicotera–Tropea)
1986.09.30Diocese of Nocera de’ Pagani was renamed as Diocese of Nocera Inferiore–Sarno (gained territory from the suppressed Diocese of Sarno)
1986.09.30Diocese of Nocera Umbra–Gualdo Tadino was suppressed (to Diocese of Assisi–Nocera Umbra–Gualdo Tadino)
1986.09.30Diocese of Noli was suppressed (to Diocese of Savona–Noli)
1986.09.30Abbacy nullius of Nonantola was suppressed (to Metropolitan Archdiocese of Modena–Nonantola and no longer united)
1986.09.30Diocese of Norcia was suppressed (to Archdiocese of Spoleto–Norcia)
1986.09.30Diocese of Nusco was suppressed (to Archdiocese of Sant’Angelo dei Lombardi–Conza–Nusco–Bisaccia)
1986.09.30Diocese of Ortona was suppressed (to Archdiocese of Lanciano–Ortona)
1986.09.30Diocese of Orvieto was renamed as Diocese of Orvieto–Todi (gained territory from the suppressed Diocese of Todi)
1986.09.30Diocese of Osimo was suppressed (to Metropolitan Archdiocese of Ancona–Osimo)
1986.09.30Diocese of Ostuni was suppressed (to Archdiocese of Brindisi–Ostuni)
1986.09.30Diocese of Pergola was suppressed (to Diocese of Fano–Fossombrone–Cagli–Pergola)
1986.09.30Metropolitan Archdiocese of Perugia was renamed as Metropolitan Archdiocese of Perugia–Città della Pieve (gained territory from the suppressed Diocese of Città della Pieve and lost suffragan sees Città della Pieve and Nocera Umbra–Gualdo Tadino)
1986.09.30Diocese of Pienza was suppressed (to Diocese of Montepulciano–Chiusi–Pienza)
1986.09.30Diocese of Sovana–Pitigliano–Orbetello was renamed as Diocese of Pitigliano–Sovana–Orbetello
1986.09.30Diocese of Policastro was suppressed (to Diocese of Teggiano–Policastro)
1986.09.30Diocese of Pontecorvo was suppressed (to Diocese of Sora–Aquino–Pontecorvo)
1986.09.30Diocese of Porto e Santa Rufina was renamed as Diocese of Porto–Santa Rufina
1986.09.30Metropolitan Archdiocese of Potenza was renamed as Metropolitan Archdiocese of Potenza–Muro Lucano–Marsico Nuovo (gained territory from the suppressed Diocese of Marsico Nuovo and Diocese of Muro Lucano and lost suffragan sees Marsico Nuovo, Muro Lucano, Rapolla and Venosa)
1986.09.30Diocese of Priverno was suppressed (to Diocese of Latina–Terracina–Sezze–Priverno)
1986.09.30Diocese of Rapolla was suppressed (to Diocese of Melfi–Rapolla–Venosa)
1986.09.30Metropolitan Archdiocese of Ravenna was renamed as Metropolitan Archdiocese of Ravenna–Cervia (gained territory from the suppressed Diocese of Cervia and lost suffragan sees Cervia and Sarsina)
1986.09.30Diocese of Recanati was suppressed (to Diocese of Macerata–Tolentino–Recanati–Cingoli–Treia)
1986.09.30Metropolitan Archdiocese of Reggio Calabria was renamed as Metropolitan Archdiocese of Reggio Calabria–Bova (gained territory from the suppressed Diocese of Bova, lost suffragan sees Cariati, Nicotera, Squillace and Tropea and gained suffragan sees Rossano–Cariati and Mileto–Nicotera–Tropea)
1986.09.30Diocese of Reggio Emilia was renamed as Diocese of Reggio Emilia–Guastalla (gained territory from the suppressed Diocese of Guastalla)
1986.09.30Archdiocese of Rossano was renamed as Archdiocese of Rossano–Cariati (gained territory from the suppressed Diocese of Cariati and became suffragan of Reggio Calabria–Bova)
1986.09.30Diocese of Ruvo was suppressed (to Diocese of Molfetta–Ruvo–Giovinazzo–Terlizzi)
1986.09.30Diocese of Sabina e Poggio Mirteto was renamed as Diocese of Sabina–Poggio Mirteto
1986.09.30Metropolitan Archdiocese of Salerno was renamed as Metropolitan Archdiocese of Salerno–Campagna–Acerno (gained territory from the suppressed Diocese of Acerno and Diocese of Campagna and lost suffragan sees Acerno, Cava de’ Tirreni, Policastro and Sarno)
1986.09.30Diocese of Ripatransone–San Benedetto del Tronto was renamed as Diocese of San Benedetto del Tronto–Ripatransone–Montalto (gained territory from the suppressed Diocese of Montalto)
1986.09.30Diocese of San Severino was suppressed (to Archdiocese of Camerino–San Severino Marche)
1986.09.30Diocese of Sansepolcro was suppressed (to Diocese of Arezzo–Cortona–Sansepolcro)
1986.09.30Territorial Prelature of Santa Lucia del Mela was suppressed (to Metropolitan Archdiocese of Messina–Lipari–Santa Lucia del Mela)
1986.09.30Archdiocese of Santa Severina was suppressed (to Archdiocese of Crotone–Santa Severina)
1986.09.30Territorial Abbacy of Santissimo Salvatore (Italo-Albanese Rite) was suppressed (to Metropolitan Archdiocese of Messina–Lipari–Santa Lucia del Mela and united to Metropolitan Archdiocese of Messina)
1986.09.30Diocese of Sant’Agata de’ Goti was suppressed (to Diocese of Cerreto Sannita–Telese–Sant’Agata de’ Goti)
1986.09.30Diocese of Sant’Angelo dei Lombardi was promoted as Archdiocese of Sant’Angelo dei Lombardi–Conza–Nusco–Bisaccia (gained territory from the suppressed Archdiocese of Conza, Diocese of Bisaccia and Diocese of Nusco)
1986.09.30Diocese of Sant’Angelo in Vado was suppressed (to Metropolitan Archdiocese of Urbino–Urbania–Sant’Angelo in Vado)
1986.09.30Diocese of Sarno was suppressed (to Diocese of Nocera Inferiore–Sarno)
1986.09.30Diocese of Sarsina was suppressed (to Diocese of Cesena–Sarsina)
1986.09.30Diocese of Sarzana was suppressed (to Diocese of La Spezia–Sarzana–Brugnato)
1986.09.30Diocese of Savona was renamed as Diocese of Savona–Noli (gained territory from the suppressed Diocese of Noli)
1986.09.30Diocese of Segni was suppressed (to Diocese of Velletri–Segni)
1986.09.30Diocese of Sezze was suppressed (to Diocese of Latina–Terracina–Sezze–Priverno)
1986.09.30Metropolitan Archdiocese of Siena was renamed as Metropolitan Archdiocese of Siena–Colle di Val d’Elsa–Montalcino (gained territory from the suppressed Diocese of Colle di Val d’Elsa and Diocese of Montalcino, lost suffragan see Chiusi and gained suffragan see Montepulciano–Chiusi–Pienza)
1986.09.30Diocese of Sora was renamed as Diocese of Sora–Aquino–Pontecorvo (gained territory from the suppressed Diocese of Aquino and Diocese of Pontecorvo)
1986.09.30Archdiocese of Sorrento was renamed as Archdiocese of Sorrento–Castellammare di Stabia (gained territory from the suppressed Diocese of Castellammare di Stabia)
1986.09.30Archdiocese of Spoleto was renamed as Archdiocese of Spoleto–Norcia (gained territory from the suppressed Diocese of Norcia)
1986.09.30Diocese of Squillace was suppressed (to Archdiocese of Catanzaro–Squillace)
1986.09.30Diocese of Sulmona was renamed as Diocese of Sulmona–Valva (gained territory from the suppressed Diocese of Valva)
1986.09.30Diocese of Tarquinia was suppressed (to Diocese of Civitavecchia–Tarquinia)
1986.09.30Diocese of Teano was renamed as Diocese of Teano–Calvi (gained territory from the suppressed Diocese of Calvi)
1986.09.30Diocese of Diano–Teggiano was renamed as Diocese of Teggiano–Policastro (gained territory from the suppressed Diocese of Policastro)
1986.09.30Diocese of Tempio–Ampurias was established (from the suppressed Diocese of Ampurias and Diocese of Civita–Tempio and became suffragan of Sassari)
1986.09.30Diocese of Teramo was renamed as Diocese of Teramo–Atri (gained territory from the suppressed Diocese of Atri)
1986.09.30Diocese of Terlizzi was suppressed (to Diocese of Molfetta–Ruvo–Giovinazzo–Terlizzi)
1986.09.30Diocese of Termoli was renamed as Diocese of Termoli–Larino (gained territory from the suppressed Diocese of Larino)
1986.09.30Diocese of Terni was renamed as Diocese of Terni–Narni–Amelia (gained territory from the suppressed Diocese of Amelia and Diocese of Narni)
1986.09.30Diocese of Terralba was suppressed (to Diocese of Ales–Terralba)
1986.09.30Diocese of Todi was suppressed (to Diocese of Orvieto–Todi)
1986.09.30Diocese of Tolentino was suppressed (to Diocese of Macerata–Tolentino–Recanati–Cingoli–Treia)
1986.09.30Archdiocese of Trani was renamed as Archdiocese of Trani–Barletta–Bisceglie (gained territory from the suppressed Archdiocese of Barletta and Diocese of Bisceglie)
1986.09.30Diocese of Treia was suppressed (to Diocese of Macerata–Tolentino–Recanati–Cingoli–Treia)
1986.09.30Diocese of Troia was suppressed (to Diocese of Lucera–Troia)
1986.09.30Diocese of Tropea was suppressed (to Diocese of Mileto–Nicotera–Tropea)
1986.09.30Diocese of Urbania was suppressed (to Metropolitan Archdiocese of Urbino–Urbania–Sant’Angelo in Vado)
1986.09.30Metropolitan Archdiocese of Urbino was renamed as Metropolitan Archdiocese of Urbino–Urbania–Sant’Angelo in Vado (gained territory from the suppressed Diocese of Sant’Angelo in Vado and Diocese of Urbania, lost suffragan see Cagli and gained suffragan see Fano–Fossombrone–Cagli–Pergola)
1986.09.30Diocese of Vallo di Lucania was renamed as Diocese of Vallo della Lucania
1986.09.30Diocese of Valva was suppressed (to Diocese of Sulmona–Valva)
1986.09.30Diocese of Vasto was suppressed (to Metropolitan Archdiocese of Chieti–Vasto)
1986.09.30Diocese of Velletri was renamed as Diocese of Velletri–Segni (gained territory from the suppressed Diocese of Segni)
1986.09.30Diocese of Venafro was suppressed (to Diocese of Isernia–Venafro)
1986.09.30Diocese of Venosa was suppressed (to Diocese of Melfi–Rapolla–Venosa)
1986.09.30Diocese of Vieste was suppressed (to Archdiocese of Manfredonia–Vieste)
1986.09.30Diocese of Viterbo was renamed as Diocese of Viterbo, Acquapendente, Bagnoregio, Montefiascone, Tuscania e San Martino al Monte Cimino (gained territory from the suppressed Diocese of Acquapendente and Diocese of Bagnoregio)
1988Archdiocese of Amalfi–Cava de’ Tirreni lost territory to Metropolitan Archdiocese of Salerno–Campagna–Acerno
1988Diocese of Nardò–Gallipoli lost territory to Archdiocese of Otranto
1988Archdiocese of Otranto lost territory to Metropolitan Archdiocese of Lecce and Diocese of Ugento–Santa Maria di Leuca
1988.02.23Diocese of Massa was renamed as Diocese of Massa Carrara–Pontremoli (gained territory from the suppressed Diocese of Pontremoli)
1988.02.23Diocese of Pontremoli was suppressed (to Diocese of Massa Carrara–Pontremoli)
1989.03.03Metropolitan Archdiocese of Milano (Ambrosian Rite) lost territory to Diocese of Lodi
1989.09.16Metropolitan Archdiocese of Genova–Bobbio was renamed as Metropolitan Archdiocese of Genova (lost territory to Diocese of Chiavari and Diocese of Piacenza–Bobbio)
1989.09.16Diocese of Piacenza was renamed as Diocese of Piacenza–Bobbio (gained territory from Metropolitan Archdiocese of Genova–Bobbio)
1989.11.18Archdiocese of Catanzaro–Squillace exchanged territory with Diocese of Locri–Gerace
1989.11.18Archdiocese of Cosenza–Bisignano lost territory to Archdiocese of Catanzaro–Squillace
1989.11.18Archdiocese of Crotone–Santa Severina lost territory to Archdiocese of Catanzaro–Squillace
1989.11.18Diocese of Locri–Gerace exchanged territory with Archdiocese of Catanzaro–Squillace
1990Diocese of Fano–Fossombrone–Cagli–Pergola lost territory to Metropolitan Archdiocese of Urbino–Urbania–Sant’Angelo in Vado
1990Titular Episcopal See of Foro Flaminii was renamed as Titular Episcopal See of Foro Flaminio
1991Titular Episcopal See of Acquapendente was restored
1991Titular Episcopal See of Bagnoregio was restored
1991Titular Episcopal See of Gallese was restored
1991Titular Episcopal See of Nepi was restored
1991Titular Episcopal See of Orte was restored
1991Titular Episcopal See of Sutri was restored
1991Titular Episcopal See of Tuscania was restored
1991.02.16Titular Episcopal See of Montefiascone was restored
1991.02.16Diocese of Viterbo, Acquapendente, Bagnoregio, Montefiascone, Tuscania e San Martino al Monte Cimino was renamed as Diocese of Viterbo
1991.03.25Diocese of Albano exchanged territory with Diocese of Latina–Terracina–Sezze–Priverno
1991.03.25Diocese of Latina–Terracina–Sezze–Priverno exchanged territory with Diocese of Albano
1992.06.29Diocese of Civita Castellana lost territory to Diocese of Terni–Narni–Amelia
1992.09.05Diocese of Massa Carrara–Pontremoli lost territory to Archdiocese of Lucca
1994Diocese of San Severo lost territory to Metropolitan Archdiocese of Foggia–Bovino
1995Titular Episcopal See of Thurio was restored
1995.10.18Diocese of Avellino lost territory to Archdiocese of Sant’Angelo dei Lombardi–Conza–Nusco–Bisaccia
1997Titular Episcopal See of Bisarcio was restored
1997.03.06Diocese of Ariano Irpino–Lacedonia exchanged territory with Metropolitan Archdiocese of Benevento
1997.03.06Metropolitan Archdiocese of Benevento exchanged territory with Diocese of Ariano Irpino–Lacedonia
1997.11.18Archdiocese of Cosenza–Bisignano lost territory to Diocese of San Marco Argentano–Scalea
1998.01.25Diocese of Ariano Irpino–Lacedonia exchanged territory with Metropolitan Archdiocese of Benevento
1998.01.25Diocese of Avellino lost territory to Archdiocese of Sant’Angelo dei Lombardi–Conza–Nusco–Bisaccia and Diocese of Ariano Irpino–Lacedonia
1998.01.25Metropolitan Archdiocese of Benevento lost territory to Diocese of Avellino
1998.01.25Metropolitan Archdiocese of Salerno–Campagna–Acerno lost territory to Diocese of Avellino
1998.01.25Archdiocese of Sant’Angelo dei Lombardi–Conza–Nusco–Bisaccia lost territory to Metropolitan Archdiocese of Potenza–Muro Lucano–Marsico Nuovo and Diocese of Ariano Irpino–Lacedonia
2000.03.11Diocese of Pesaro was promoted as Metropolitan Archdiocese of Pesaro (with suffragan sees Urbino–Urbania–Sant’Angelo in Vado and Fano–Fossombrone–Cagli–Pergola)
2000.03.11Metropolitan Archdiocese of Urbino–Urbania–Sant’Angelo in Vado was demoted as Archdiocese of Urbino–Urbania–Sant’Angelo in Vado (became suffragan of Pesaro)
2000.12.02Diocese of Agrigento was promoted as Metropolitan Archdiocese of Agrigento (with suffragan sees Caltanissetta and Piazza Armerina)
2000.12.02Archdiocese of Catania was promoted as Metropolitan Archdiocese of Catania (with suffragan sees Acireale and Caltagirone)
2000.12.02Metropolitan Archdiocese of Monreale was demoted as Archdiocese of Monreale (became suffragan of Palermo)
2001.01.30Archdiocese of Catanzaro–Squillace was promoted as Metropolitan Archdiocese of Catanzaro–Squillace (with suffragan sees Crotone–Santa Severina and Lamezia Terme)
2001.01.30Archdiocese of Cosenza–Bisignano was promoted as Metropolitan Archdiocese of Cosenza–Bisignano (with suffragan sees Rossano–Cariati, Cassano all’Jonio and San Marco Argentano–Scalea)
2001.04.27Diocese of Cremona lost territory to Diocese of Crema
2002Titular Episcopal See of Canosa was restored
2002.07.16Territorial Abbacy of Subiaco lost territory to Diocese of Anagni–Alatri, Diocese of Palestrina and Diocese of Tivoli
2002.12.06Archdiocese of Manfredonia–Vieste was renamed as Archdiocese of Manfredonia–Vieste–San Giovanni Rotondo
2003.01.14Diocese of Fidenza exchanged territory with Diocese of Parma and Diocese of Piacenza–Bobbio
2003.01.14Diocese of La Spezia–Sarzana–Brugnato lost territory to Diocese of Massa Carrara–Pontremoli
2003.01.14Diocese of Massa Carrara–Pontremoli lost territory to Diocese of Piacenza–Bobbio
2003.01.14Diocese of Parma exchanged territory with Diocese of Fidenza and Diocese of Piacenza–Bobbio
2003.01.14Diocese of Piacenza–Bobbio exchanged territory with Diocese of Fidenza and Diocese of Parma
2004.05Titular Episcopal See of Arna was restored
2004.06Titular Episcopal See of Biccari was restored
2004.06Titular Episcopal See of Carmeiano was restored
2004.06Titular Episcopal See of Egnazia Appula was restored
2004.06Titular Episcopal See of Erdonia was restored
2004.10Titular Episcopal See of Galtellì was restored
2004.10Titular Episcopal See of Ostra was restored
2004.10Titular Episcopal See of Ottana was restored
2005.03.07Territorial Abbacy of San Paolo fuori le Mura was suppressed (to Papal See of Roma)
2005.05.15Territorial Abbacy of Montevergine lost territory to Diocese of Avellino
2009.01Titular Episcopal See of Aveia was restored
2009.01Titular Episcopal See of Celano was restored
2009.01Titular Episcopal See of Sepino was restored
2010.05.31Metropolitan Archdiocese of Pescara–Penne lost territory to Metropolitan Archdiocese of Chieti–Vasto
2012.07.17Papal See of Roma lost territory to Diocese of Ostia
2012.08.20Territorial Abbacy of Santissima Trinità di Cava de’ Tirreni lost territory to Archdiocese of Amalfi–Cava de’ Tirreni
2014.08.08Diocese of Verona lost territory to Diocese of Vicenza
2014.10.23Territorial Abbacy of Montecassino lost territory to Diocese of Sora–Cassino–Aquino–Pontecorvo
2014.10.23Diocese of Sora–Aquino–Pontecorvo was renamed as Diocese of Sora–Cassino–Aquino–Pontecorvo (gained territory from Territorial Abbacy of Montecassino)
2016.06.26Diocese of Novara exchanged territory with Diocese of Vigevano
2016.06.26Diocese of Vigevano exchanged territory with Diocese of Novara
2017.07.15Diocese of Arezzo–Cortona–Sansepolcro lost territory to Metropolitan Archdiocese of Perugia–Città della Pieve
2017.12Titular Episcopal See of Amantea was restored
2017.12Titular Episcopal See of Limosano was restored
2017.12Titular Episcopal See of Malamocco was restored
2018.01Titular Episcopal See of Bisenzio was restored
2018.01Titular Episcopal See of Milazzo was restored
2018.01Titular Episcopal See of Rosella was restored
2018.03Titular Episcopal See of Alesa was restored
2018.06.29Patriarchal See of Venezia lost territory to Diocese of Concordia–Pordenone
2019.07.11Apostolic Exarchate of Italy (Ukrainian Rite) was established
2022.12.17Titular Episcopal See of Cingoli was restored (from Diocese of Macerata–Tolentino–Recanati–Cingoli–Treia)
2022.12.17Diocese of Macerata–Tolentino–Recanati–Cingoli–Treia was renamed as Diocese of Macerata (lost territory to establish Titular Episcopal See of Cingoli, Titular Episcopal See of Recanati, Titular Episcopal See of Tolentino and Titular Episcopal See of Treia)
2022.12.17Titular Episcopal See of Recanati was restored (from Diocese of Macerata–Tolentino–Recanati–Cingoli–Treia)
2022.12.17Titular Episcopal See of Tolentino was restored (from Diocese of Macerata–Tolentino–Recanati–Cingoli–Treia)
2022.12.17Titular Episcopal See of Treia was restored (from Diocese of Macerata–Tolentino–Recanati–Cingoli–Treia)
2023.06.01Diocese of Cuneo was renamed as Diocese of Cuneo–Fossano (gained territory from the suppressed Diocese of Fossano)
2023.06.01Diocese of Fossano was suppressed (to Diocese of Cuneo–Fossano)

Last updated on 2024.02.27

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