| Date | From | To |
|---|
| 8th Century | | | Diocese of Gallese, Italy
| Erected |
| 8th Century | | | Diocese of Veroli, Italy
| Erected |
| 8th Century | | | Diocese of Gaeta, Italy
| Erected |
| 8th Century | Diocese of Köln, Germany
| Elevated | Archdiocese of Köln {Cologne}, Germany
| Elevated |
| 8th Century | | | Diocese of Conza, Italy
| Erected |
| 8th Century | | | Diocese of Bisceglie, Italy
| Erected |
| 8th Century | Diocese of Trier, Germany
| Elevated | Archdiocese of Trier, Germany
| Elevated |
| 8th Century | | | Diocese of Sezze, Italy
| Erected |
| 8th Century | | | Territorial Abbey of Nonantola, Italy
| Erected |
