The Breton and French Catholic diocese of Dol, situated in the northern part of the department of Ille-et-Vilaine, 6 km (3.8 mi) from the English Channel coast and 22 km (14 mi) southeast of Saint-Malo, existed from 848 until the French Revolution. It was suppressed by the Concordat of 1801.[1]
The seat of the bishop was the cathedral of Saint Samson. Its scattered territory (deriving from the holdings of the Celtic monastery, and including an enclave at the mouth of the Seine) was shared mainly by the Diocese of Rennes and the Diocese of Saint-Brieuc.