Some records show the wife of William de Warenne as Miss de Tosta. Also at one time it was thought that Gundred was the daughter of William the Conqueror. For details see "Early Yorkshire Charters" by C.T. Clay or "Etudes surQuelques Points de L'Histoire de Guillame le Conquerant" by H.Prentout described under Surrey in "The Complete Peerage" by G.E. Gibbs.