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Male Guillaume de Brittany Click to view Guillaume de Brittany in the family tree

Guillaume was born about 1065.  Guillaume's father was Eudon comes Britanniae and his mother is Agnes de Nantes de Cornouaille.  His paternal grandparents were Godfrey (Geoffrey) de Brittany and Hedwig (Havoise) de Normandy; his maternal grandparents were Alain Canhiart of Cornouaille and Judith de Nantes. He had seven brothers named Geoffrey I comes Britanniae, Brian comes Britanniae, Alan the Black comes, Alan the Red comes, Richard, Robert and Stephen comes. He had a half-brother named Bardolf of.

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