Fulk could be ruthless at times. His treatment of his first wife is an example. When he thought she had committed adultery, he ordered his countess to be executed by burning. They had been married nearly fifteen years when she died. Fulk continued to control Vendome through their daughter, Adele, and her family. In 1028 Fulk and his second wife, Hildegarde, founded the abbey of Le Ronceray. Originally a church dedicated to St. Mary, Hildegard was very active in its rebuilding into an abbey. They gave the abbey many gifts including the forest of Lattay. Fulk died 1 April 1040 while returning from his last pilgrimage.