"Consultu Amalrici senioris de Monteforti filii Guillelmi Hanoensis" (Ord. Vit., Historia Ecclesiastica, ed. Le Prévost, vol. iii, p. 223). This alleged origin of the family of Montfort possibly derives support from the fact that Amauri's grandson Amauri married a daughter of the Count of Hainault and afterwards repudiated her. This may imply consanguinity and that William not only came from Hainault, but was connected with the ruling house.260

Cokayne's "Complete Peerage" (Appendix D to v.VII, p.708). All we know of him is that he was AMURAI's father.