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.
See also: Dukes of Brittany family tree
