The identity of the mother-in-law of Eudes "le Champenois" is unclear, although she must have been the oldest sister of Gosbert [III] de la Ferté in view of the transmission of the vicomté de Dijon to her descendants. It appears unlikely that she was Mathilde de la Ferté as Sibylle was not named with Mathilde´s other two daughters in the charter dated to before 1145..
