Ermengarde-Gerberga was born c. 956,[1] the daughter of Geoffrey I, Count of Anjou and Adele of Meaux.
[3] Her husband Conan of Rennes opposed her father and brother Fulk even though the marriage was apparently designed to form a political alliance between Anjou and Brittany.
[4] Even after Conan had been killed by Fulk at the Battle of Conquereuil in 992, and during the period 992-994 when Ermengarde was Regent for their son Geoffrey, she remained loyal to her brother Fulk III, Count of Anjou.
[4] In 992, following the interests of her brother, and functioning as Regent, she accepted Capetian over-lordship for Rennes while rejecting that of Odo I, Count of Blois.
[5] About 1000[6] her brother Fulk III arranged his widowed sister to marry, secondly, William II of Angoulême, one of his close allies.