Philip de Malvoisin is a friend and supporter of Prince John. As a Norman lord, he abuses the English subjects living near his lands. Along with Sir Brian de Bois-Guilbert, Reginald Front-de-Boeuf, Hugh de Grantmesnil, and Sir Ralph Vipont, he is one of the challengers of the tournament at Ashby-de-la-Zouche. King Richard I has Philip executed along with his brother Albert de Malvoisin for treason.