| Date | From | To | ||
|---|---|---|---|---|
| 4th Century | Diocese of Agen, France | Erected | ||
| 4th Century | Diocese of Alba (Pompea), Italy | Erected | ||
| 4th Century | Diocese of Acqui, Italy | Erected | ||
| 4th Century | Diocese of Ávila, Spain | Erected | ||
| 4th Century | Diocese of Ascoli Piceno, Italy | Erected | ||
| 4th Century | Diocese of Barcelona, Spain | Erected | ||
| 4th Century | Diocese of Bari, Italy | Erected | ||
| 4th Century | Diocese of Bayonne, France ((or 6th Century)) | Erected | ||
| 4th Century | Diocese of Besançon, France | Elevated | Archdiocese of Besançon, France | Elevated |
| 4th Century | Diocese of Bergamo, Italy | Erected | ||
| 4th Century | Diocese of Braga, Portugal | Erected | ||
| 4th Century | Diocese of Brindisi, Italy | Erected | ||
| 4th Century | Diocese of Cagliari, Italy | Erected | ||
| 4th Century | Diocese of Squillace, Italy | Erected | ||
| 4th Century | Diocese of Sarsina, Italy | Erected | ||
| 4th Century | Diocese of Concordia (Sagittaria), Italy | Erected | ||
| 4th Century | Diocese of Como, Italy | Erected | ||
| 4th Century | Diocese of Cremona, Italy | Erected | ||
| 4th Century | Diocese of Cagli, Italy | Erected | ||
| 4th Century | Diocese of Digne, France | Erected | ||
| 4th Century | Diocese of Évora, Portugal | Erected | ||
| 4th Century | Diocese of Ferentino, Italy | Erected | ||
| 4th Century | Diocese of Gerona, Spain | Erected | ||
| 4th Century | Diocese of Piacenza, Italy | Erected | ||
| 4th Century | Diocese of Grenoble, France | Erected | ||
| 4th Century | Diocese of Imola, Italy | Erected | ||
| 4th Century | Diocese of Genève {Geneva}, Switzerland | Erected | ||
| 4th Century | Diocese of León, Spain | Erected | ||
| 4th Century | Diocese of Lisboa, Portugal | Erected | ||
| 4th Century | Diocese of Lodi, Italy | Erected | ||
| 4th Century | Diocese of Lucera, Italy | Erected | ||
| 4th Century | Diocese of Mainz, Germany | Erected | ||
| 4th Century | Diocese of Milano, Italy | Elevated | Archdiocese of Milano {Milan}, Italy | Elevated |
| 4th Century | Diocese of Nantes, France | Erected | ||
| 4th Century | Diocese of Novara, Italy | Erected | ||
| 4th Century | Suburbicarian See of Palestrina, Italy | Erected | ||
| 4th Century | Diocese of Parma, Italy | Erected | ||
| 4th Century | Diocese of Pisa, Italy | Erected | ||
| 4th Century | Diocese of Porto, Portugal | Erected | ||
| 4th Century | Diocese of Sevilla, Spain | Elevated | Archdiocese of Sevilla {Seville}, Spain | Elevated |
| 4th Century | Suburbicarian See of Albano, Italy | Erected | ||
| 4th Century | Archdiocese of Dardania, North Macedonia | Erected | ||
| 4th Century | Diocese of Siena, Italy | Erected | ||
| 4th Century | Diocese of Sion {Sitten}, Switzerland | Erected | ||
| 4th Century | Diocese of Castellammare di Stabia, Italy | Erected | ||
| 4th Century | Diocese of Speyer, Germany | Erected | ||
| 4th Century | Diocese of Strasbourg, France | Erected | ||
| 4th Century | Diocese of Narni, Italy | Erected | ||
| 4th Century | Diocese of Civita (Tempio), Italy | Erected | ||
| 4th Century | Diocese of Toledo, Spain | Elevated | Archdiocese of Toledo, Spain | Elevated |
| 4th Century | Diocese of Torino, Italy | Erected | ||
| 4th Century | Diocese of Tortosa, Spain | Erected | ||
| 4th Century | Diocese of Treviso, Italy | Erected | ||
| 4th Century | Diocese of Troyes, France | Erected | ||
| 4th Century | Diocese of Urgell, Spain | Erected | ||
| 4th Century | Diocese of Valence, France | Erected | ||
| 4th Century | Diocese of Acerenza, Italy | Erected | ||
| 4th Century | Eparchy of Alep (Melkite Greek), Syria | Erected | ||
| 4th Century | Diocese of Avignon, France | Erected | ||
| 4th Century | Diocese of Sirmio (Srijem; Sirmium), Croatia | Erected | ||
| 4th Century | Confederation of Canons Regular of St. Augustine | Founded | ||
| 4th Century | Cardinal Titular Church of Albano | Erected | ||
| 4th Century | Cardinal Titular Church of Palestrina | Erected | ||
| 4th Century | Cardinal Titular Church of Santa Cecilia | Established | ||
| 4th Century | Diocese of Antibes, France | Erected | ||
| 4th Century | Diocese of Apt, France | Erected | ||
| 4th Century | Diocese of Chalons-sur-Marne, France | Erected | ||
| 4th Century | Diocese of Cimiez, France | Erected | ||
| 4th Century | Diocese of (Saint-Lizier de) Couserans (or Conserans), France | Erected | ||
| 4th Century | Diocese of Embrun, France | Erected | ||
| 4th Century | Diocese of Fréjus, France | Erected | ||
| 4th Century | Diocese of Lectoure, France | Erected | ||
| 4th Century | Diocese of Nevers, France | Erected | ||
| 4th Century | Diocese of Reims, France | Elevated | Archdiocese of Reims, France | Elevated |
| 4th Century | Diocese of Saint-Paul-Trois-Châteaux, France | Erected | ||
| 4th Century | Diocese of Tarbes, France | Erected | ||
| 4th Century | Diocese of Verdun, France | Erected | ||
| 4th Century | Diocese of Vernay, France | Erected | ||
| 4th Century | Diocese of Viviers (Aps), France | Erected | ||
| 4th Century | Diocese of Aosta, Italy | Erected | ||
| 4th Century | Diocese of London, England, Great Britain | Erected | ||
| 4th Century | Archdiocese of Beirut {Bairut} (Melkite Greek), Lebanon | Erected | ||
| 4th Century | Diocese of Amiterno, Italy | Erected | ||
| 4th Century | Diocese of Atella, Italy | Erected | ||
| 4th Century | Diocese of Eca, Italy | Erected | ||
| 4th Century | Diocese of Helvetii / Aventicum [Avenches] / Vindonissa [Windisch], Switzerland | Erected | ||
| 4th Century | Diocese of Ancyra (Phrygia), Turkey | Erected | ||
| 4th Century | Apostolic Chancery, Roman Curia | Established | ||
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