After the death of his first wife Adele, Geoffrey married secondly Adelaise de Châlon. By this marriage he exerted control over the county of Châlons. Through the marriage of his son, Fulk III, to Elisabeth the heiress of Vendôme Geoffrey brought that county under his influence. Geoffrey made his son Fulk Nerra his co-ruler just before he died while attacking the fortress of Marcon on 21 July 987.