| 1ˢᵗ century | 2ⁿᵈ century |  |
| 1ˢᵗ century | 2ⁿᵈ century | |
Date | Country | Change |
| 30 |  Egypt | Diocese of Alexandria was established |
| 30 |  Palestine,  Cyprus,  Israel,  Jordan | Diocese of Jerusalem was established |
| 38 |  Turkiye | Diocese of Byzantium was established |
| 40 |  Italy | Diocese of Taormina was established |
| 40 | Turkiye | Diocese of Antioch was established |
| 42 | Italy | Diocese of Catania was established |
| 47 |  Spain | Diocese of Acci was established |
| 50 | Cyprus | Metropolitan Archdiocese of Salamis postea Constantia was established |
| 50 | Italy,  Vatican City State | Papal See of Roma was established |
| 50 |  Lebanon | Diocese of Byblus was established |
| 50 | Turkiye | Metropolitan Archdiocese of Ephesus was established |
| 50 | Turkiye | Diocese of Sinope was established |
| 100 |  France | Diocese of Aix was established |
| 100 | France | Diocese of Limoges was established |
| 100 |  Greece | Diocese of Cnossus was established |
| 100 | Greece | Metropolitan Archdiocese of Corinthus was established |
| 100 | Greece | Diocese of Epidaurum was established |
| 100 | Greece | Metropolitan Archdiocese of Gortina was established |
| 100 | Greece | Diocese of Philippi was established |
| 100 | Greece | Metropolitan Archdiocese of Thessalonica was established |
| 100 | Israel | Metropolitan Archdiocese of Cæsarea was established |
| 100 | Israel | Diocese of Ptolemais was established |
| 100 | Italy | Diocese of Agrigento was established |
| 100 | Italy | Diocese of Benevento was established |
| 100 | Italy | Diocese of Napoli was established |
| 100 | Italy | Diocese of Nepi was established |
| 100 | Italy | Diocese of Palermo was established |
| 100 | Italy | Diocese of Pozzuoli was established |
| 100 | Italy | Diocese of Spoleto was established (without ecclesiastical province) |
| 100 | Italy | Diocese of Thurio was established |
| 100 | Italy | Diocese of Tricala was established |
| 100 | Italy | Diocese of Vescovìo was established |
| 100 |  Libya | Diocese of Cyrene was established |
| 100 |  Malta | Diocese of Malta was established |
| 100 | Palestine | Diocese of Gaza was established |
| 100 | Spain | Diocese of Cartagena was established |
| 100 | Spain | Diocese of Iliturgi was established |
| 100 | Spain | Diocese of Italica was established |
| 100 | Spain | Diocese of Lugo was established |
| 100 | Spain | Diocese of Toledo (Mozarabic Rite) was established |
| 100 | Spain | Diocese of Écija was established |
| 100 | Turkiye | Metropolitan Archdiocese of Cesarea in Cappadocia was established |
| 100 | Turkiye | Diocese of Colossæ was established |
| 100 | Turkiye | Archdiocese of Edessa was established |
| 100 | Turkiye | Archdiocese of Heraclea was established |
| 100 | Turkiye | Diocese of Hierapolis was established |
| 100 | Turkiye | Diocese of Laodicea was established |
| 100 | Turkiye | Diocese of Myra was established |
| 100 | Turkiye | Diocese of Nicomedia was established |
| 1ˢᵗ century | 2ⁿᵈ century | |
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