Eudes of Rennes (999 - 1079), count of Penthievre, was the youngest son of Duke Geoffrey I of Brittany. Following the death of his brother Duke Alan III, Eudes ruled as regent of Brittany in the name of his nephew Conan II, between 1040 and 1062. Eudes married Agnes of Cornwall, sister of Hoel II of Brittany and had several sons and daughters. His descendents became the junior branch of the Breton ducal family, that assumed control of the duchy in 1156 under Conan IV of Brittany.
Conan II of Rennes (died 1066) was duke of Brittany, from 1040 to his death.
Brittany was ruled by his uncle Eudes of Brittany in the first twenty years as duke.
Conan faced numerous threats to the duchy of Brittany, including revolts from his nobles and attacks by William, duke of Normandy, afterwards king of England.
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