The 1064–1065 animosity between Brittany and Normandy was sparked after William the Conqueror, as Duke of Normandy, supported a Breton, Rivallon I of Dol's rebellion against the hereditary Duke of Brittany, Conan II. The Breton–Norman War of 1064–1066 was fought between the sovereign Duchy of Brittany and the Duchy of Normandy.īrittany, an independent Celtic duchy, had a traditional rivalry with neighboring Normandy.įrom a historical perspective, the Bretons had steadily lost lands to the Norman's ancestors, the Seine River Vikings.
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