| 1ˢᵗ century | 2ⁿᵈ century | 3ʳᵈ century |
| Date | Country | Change |
| 135 | Diocese of Jerusalem was renamed as Diocese of Aelia Capitolina | |
| 140 | Diocese of Terni was established | |
| 150 | Diocese of Lyon was established | |
| 200 | Diocese of Bagai was established | |
| 200 | Diocese of Milevum was established | |
| 200 | Diocese of Tubunæ was established | |
| 200 | Diocese of Sofia was established | |
| 200 | Diocese of Nilopolis was established | |
| 200 | Diocese of Autun was established | |
| 200 | Diocese of Besançon was established | |
| 200 | Diocese of Rhodes was established | |
| 200 | Diocese of Aquileia was established | |
| 200 | Diocese of Capua was established | |
| 200 | Diocese of Forlì was established | |
| 200 | Diocese of Milano (Ambrosian Rite) was established | |
| 200 | Diocese of Nola was established | |
| 200 | Diocese of Ostia was established (became suffragan of Roma) | |
| 200 | Diocese of Todi was established | |
| 200 | Diocese of Tortona was established | |
| 200 | Diocese of Trento was established | |
| 200 | Diocese of Sabrata was established | |
| 200 | Diocese of Œa was established | |
| 200 | Diocese of Astorga was established | |
| 200 | Diocese of Italica was suppressed | |
| 200 | Archdiocese of Apamea was established | |
| 200 | Diocese of Laodicea was established | |
| 200 | Diocese of Abitinæ was established | |
| 200 | Diocese of Buslacena was established | |
| 200 | Diocese of Carthage was established | |
| 200 | Diocese of Girba was established | |
| 200 | Diocese of Hadrumetum was established | |
| 200 | Diocese of Obba was established | |
| 200 | Diocese of Urusi was established | |
| 200 | Diocese of Utica was established | |
| 200 | Diocese of Vaga was established | |
| 200 | Metropolitan Archdiocese of Amasea was established | |
| 200 | Metropolitan Archdiocese of Antiochia was established | |
| 200 | Diocese of Comana Ponti was established | |
| 200 | Diocese of Comanæ was established | |
| 200 | Metropolitan Archdiocese of Cyzicus was established | |
| 200 | Diocese of Iconium was established | |
| 200 | Diocese of Magyddus was established | |
| 200 | Metropolitan Archdiocese of Melitene was established | |
| 200 | Diocese of Mopsuestia was established | |
| 200 | Metropolitan Archdiocese of Neocæsarea was established | |
| 200 | Diocese of Olimpus was established | |
| 200 | Metropolitan Archdiocese of Sardes was established | |
| 200 | Diocese of Thyatira was established |
| 1ˢᵗ century | 2ⁿᵈ century | 3ʳᵈ century |
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