Geoffrey was born 14 October 1006. He was the son of Fulk the Black and Hildegard of Lorraine. As the count of Vendome, Geoffrey married Agnes of Burgundy. About 1038 Geoffrey was asked by Herbert Braco to help him against Gervais, the Bishop of Le Mans. During the short war between them Geoffrey broke his hip. This caused Geoffrey to have to transfer some of his vassals to Bishop Gervais.