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also Duke from 990
*992–1008 Geoffrey I, also Duke
*1008–1040 Alan I, also Duke; granted the Countship of Penthievre to his brother Eudes, thereby founding the Cadet Branch of the House of Rennes. Ruled with Odo, Count of Penthièvre until 1035.
*1040–1066 Conan II, also Duke
*1066–1082

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