Odo, Count of Penthièvre
Breton noble · Lived 999 to 1079 · aged 80
Odo of Rennes, Count of Penthièvre, was the youngest of the three sons of Duke Geoffrey I of Brittany and Hawise of Normandy, daughter of Richard I of Normandy.
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Eudon married Agnes of Cornouaille, the daughter of Alan Canhiart, Count of Cornouaille and sister of Hoel II, Duke of Brittany who was married in 1066 to Eudon's niece Hawise, Duchess of Brittany.