Ancient Diocese of Thérouanne
Roman Catholic diocese in France (7th century - 1566) / From Wikipedia, the free encyclopedia
The former French diocese of Thérouanne (Lat. Moriniensis or Taruannensis) controlled a large part of the left bank of the river Scheldt during the Middle Ages. Territorially it was part of the county of Artois which belonged to the county of Flanders.