William de Warenne, 5th Earl of Surrey English nobleman and royal official (1166–1240) Parents Hamelin de Warenne, Earl of Surrey Isabel de Warenne, Countess of Surrey Children John de Warenne, 6th Earl of Surrey Isabel de Warenne Siblings Mahant de Warenne Isabella de Warenne Adela de Warenne Partners Maud Marshal Matilda d'Aubigny