Estouteville, Guillaume a French prelate, was born before 1403. He studied at the University of Paris, entered early the Benedictine order, and was raised to the highest dignity, being successively bishop of Maurienne, Digne, Beziers, Ostia, Velletri, and Port-Sainte-Rufin, and also archbishop of Rouen. He had, among other abbeys, those of St. Ouen de Rouen, of Jumieges, of Montebourg, and of Mont St. Michel, together with the priories of St. Martin-des Champs, at Paris, Grand Pre, and Beaumont en Auge (Normandy). In 1437 he was made cardinal-priest by Eugenius IV, with the title of Silvestre et Martinz des Monts. He was legate in France under Nicholas V, and took part in the election of four pontiffs. In 1477 Sixtus IV appointed him chamberlain of the Church of Rome. D'Estouteville died dean of the sacred college, December 22, 1483. He bestowed his immense wealth on several ecclesiastical and literary institutions. See Hoefer, Nouv. Biog. Generale, s.v.