Cokayne's "Complete Peerage" (Leicester, pp.536-537), (Appendix D to v.VII, pp. 716-717). Co heiress of her brother. Cokayne's "Complete Peerage" (Chester, p.167, note c), says she was the 2nd wife of SIMON III DE MONTFORT. This is erroneous. Schwennicke ES (iii, 700). According to John W. Baldwin's, "The Government of Philip Augustus", she was married to William des Barres, a knight from the Vexin, who was prominent in royal service to KING PHILIP II of France, after Simon's death.