William FitzGeoffrey de Mandeville, 3rd Earl of Essex earl of Essex (d. 1227) Parents Beatrice de Say Geoffrey Fitz Peter, 1st Earl of Essex Children Siblings Geoffrey FitzGeoffrey de Mandeville, 2nd Earl of Essex John Fitzgeoffrey Maud de Mandeville Hawise FitzGeoffrey, Lady of Streatley Cecily fitz Geoffrey Partners Christine