Geoffrey I, Duke of Brittany From Wikipedia, the free encyclopedia. Geoffrey I of Rennes (980 - November 20, 1008) was duke of Brittany, from 992 to his death. He was son of Duke Conan I and Ermengarde of Anjou. He married Havise of Normandy and had at least two sons: Alan III his successor, and Eudes, Count of Penthievre. | ||||
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