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Odo, Count of Penthièvre

Odo I
Eudes.jpg
Duke of Brittany, with Alan III
Reign 1008–1035
Predecessor Geoffrey I
Successor Alan III by himself
Regent Hawise of Normandy
Count of Penthièvre
Reign 1035–1079
Successor Geoffrey I
Regent of Brittany
Reign 1040 - 1057
Born c. 999
Died c. 1079
Cesson
Burial Saint-Brieuc
Spouse Orguen-Agnes of Cornouaille
House House of Rennes
Father Geoffrey I
Mother Hawise of Normandy
Religion Roman Catholicism

Odo of Rennes (Medieval Breton: Eudon Pentevr, Modern Breton: Eozen Penteur, Latin: Eudo, French: Eudes/Éon de Penthièvre) (999–1079), 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. Eozen married Agnes of Cornouaille (Orguen Kernev), the daughter of Alan Canhiart, Count of Cornouaille and sister of Hoel II, Duke of Brittany who was married in 1066 to Eozen's niece Hawise, Duchess of Brittany.

When Eozen's father Duke Geoffrey I died on 20 November 1008, both Eozen and his older brother Alan were minors.

Duke Geoffrey had initiated a dynastic double marriage with Richard II, Duke of Normandy by marrying Hawise of Normandy, one of Richard's sisters, in 996; this was followed by the marriage of Geoffrey's sister Judith of Brittany to Richard around the year 1000. Alan and Eozen were thus double-first cousins of Duke Richard II's children, including Richard III, Duke of Normandy and Robert I, Duke of Normandy (William the Conqueror's father), nephews of Emma of Normandy, and first cousins of Emma's children Edward the Confessor, Harthacnut, Goda of England, Gunhilda of Denmark and Alfred Aetheling.


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