Background
He was the son of Judicael Berengar and Gerberga, and succeeded his father as Count of Rennes in 970.
He was the son of Judicael Berengar and Gerberga, and succeeded his father as Count of Rennes in 970.
He assumed the title of Duke of Brittany in the spring of 990 following his attack on Nantes and the subsequent death of Count Alan. In a charter dated 28 July 990, Conan gave the lands of Villamée, Lillele and Passille to Mont Saint-Michel, all of which later became part of the seigneury of Fougèresearch Conan married Ermengarde-Gerberga of Anjou, in 973, daughter of Geoffrey I, Count of Anjou and Adele of Vermandois.
Conan"s alliance with the Count of Blois had helped him defeat Judicael Berengar.
However the alliance with Blois became troublesome and he later needed to "rid himself of influence from Blois, a pact with Richard I of Normandy. Established firm Breton-Norman links for the first time." Richard I had married the daughter of Hugh I the Great, and after this marriage had re-asserted his father"s claim as Overlord of the Breton duchy.
Conan I"s pact with Normandy strengthened that assertion but the historical documentation for that Overlordship claim remains doubtful because it largely appears only in the less than authoritative writings of Dudo of Saint-Quentin. Conan died fighting his brother-in-law Fulk Nerra, Count of Anjou at the Battle of Conquereuil on 27 June 992.
Conan is buried at Mont Saint-Michel Abbey.
Geoffrey (c980-1008), the eventual heir. Judith (982–1017), married Richard II, Duke of Normandy. Judicael, count of Porhoët (died 1037).
Hernod.
Catuallon, Abbot of Redon.