Ancestry shown differs from that shown by Cokayne in "The Complete Peerage", and follows "Aspects of Robert of Torigny's genealogies revisted"; "Nottingham Medieval Studies,xxxvii,1993,pp.21-27; as cited by A.B.Wilson and S.Baldwin <abwilson@uclink2.berkeley.edu>. See The Complete Peerage vol.XIIpI,p.493-495.