| Date | Event | From | To | 
|---|---|---|---|
| Diocese of Thérouanne | |||
| 7th Century | Erected | Diocese of Thérouanne (erected) | |
| 12 May 1559 | Territory Lost | Diocese of Thérouanne | Diocese of Saint-Omer (erected) | 
| Diocese of Boulogne (-Sur-Mer) | |||
| 3 March 1566 | Name Changed | Diocese of Thérouanne | Diocese of Boulogne (-Sur-Mer) | 
| 29 November 1801 | Suppressed | Diocese of Boulogne (-Sur-Mer) (suppressed)
 Diocese of Saint-Omer (suppressed)  | Diocese of Arras | 
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| 
 
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