| Date | From | To |
|---|
| 10th Century | Diocese of Sabiona-Säben, Italy
| Name Changed | Diocese of Brixen {Bressanone}, Italy
| Name Changed |
| 10th Century | Diocese of Brindisi, Italy
| Elevated | Archdiocese of Brindisi, Italy
| Elevated |
| 10th Century | | | Diocese of Cashel, Ireland
| Erected |
| 10th Century | | | Diocese of Sant'Agata de' Goti, Italy
| Erected |
| 10th Century | | | Diocese of Eger, Hungary
| Erected |
| 10th Century | | | Archdiocese of Esztergom, Hungary
| Erected |
| 10th Century | | | Diocese of Kraków, Poland
| Erected |
| 10th Century | | | Diocese of Kotor, Serbia and Montenegro
| Erected |
| 10th Century | Diocese of Napoli, Italy
| Elevated | Archdiocese of Napoli {Naples}, Italy
| Elevated |
| 10th Century | | | Diocese of Płock, Poland
| Erected |
| 10th Century | Diocese of Salerno, Italy
| Elevated | Archdiocese of Salerno, Italy
| Elevated |
| 10th Century | | | Diocese of Salamanca, Spain
| Erected |
| 10th Century | | | Diocese of Savona, Italy
| Erected |
| 10th Century | | | Diocese of Prizren, Serbia and Montenegro
| Erected |
| 10th Century | Diocese of Taranto, Italy
| Elevated | Archdiocese of Taranto, Italy
| Elevated |
| 10th Century | | | Diocese of Termoli, Italy
| Erected |
| 10th Century | | | Diocese of Trivento, Italy
| Erected |
| 10th Century | | | Diocese of Wrocław, Poland
| Erected |
| 10th Century | | | Diocese of Zamora, Spain
| Erected |
| 10th Century | | | Diocese of Trebinje, Bosnia and Herzegovina
| Erected |
