Conan I (927 - June 27 992) was the count of Rennes from 958 and duke of Brittany from 990 to his death. He became ruler of Brittany after a period of civil and political unrest, having first succeeded his father Judicael Berengar, as count of Rennes. Conflicting information has been given for the family's origin, one version making Conan great-grandson of Erispoe, Duke of Brittany. This was the first Gallo family to ascend the Breton duchy, … Wikipedia
The definitive Wikipedia entry for Conan I of Rennes I of Rennes. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Conan_I_of_Rennes