SOURCE NOTES: Cokayne, George Edward, Complete Peerage of England, Scotland, Ireland, Great Britain, and the United Kingdom, extant, extinct, or dormant. Gloucester: A Sutton, 1982.
Schwennicke, Detlev, ed., Euroopaische Stammtafeln: Stammtafeln zur Geschichte der europaischen Staaten, New Series, Marburg: J.A. Stargardt, 1978-. SOURCE NOTES: date: occ um 1030 [Ref: ES III #701A]