Duke Goeffrey I Brittany 
Goeffrey I's father was Duc/Comte de Rennes et Nantes Conan I "Le Tordu" de Rennes Comte de Rennes et Nantes and his mother was Duchess of Bretaf Ermengard-Gerberge d' Anjou Duchess of Bretaf. He had a sister named Judith of. He had a half-brother and a half-sister, named Foulques IV "le Grossier" d' and Aldegarde de. He died on November 20th, 1008 in Brittany, France.
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