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Bibliography
  1. Cokayne, George Edward, Complete Peerage of England, Scotland, Ireland, Great Britain, and the United Kingdom, extant, extinct, or dormant, vol 06 Gordon-Huntley. London: St Catherine Press, 1926. Reprinted (4 per page) Gloucester: A Sutton, 1982. Available at https://familysearch.org/search/catalog/271412 Information from this source tagged as [Ref: CP VI [Ap][p0-9].*].

Sources for birth and parent Information
father:
[Ref: CP VI p450(d) (with corr in XIV p380)]
Research Notes:



Pedigree of William De BRETEUIL
                                     /-----(Unk) Forquelar Of Cirques
                            /-----Herfast
                   /-----Osbern De Crepon, Steward Of Normandy
          /-----William Fitz Osbern, Earl Of Hereford
         |        |                  /-----Asperlang
         |        |         /-----Ralph Count Of Ivry
         |        |        |         \-----Espriota
         |         \-----Emma Abbess Of St. Amand
         |                  \-----Albereda
 /-----Roger De BRETEUIL, Earl Of Hereford
|        |                                    /-----Hugh De CALVACAMP
|        |                           /-----Ralph I De TOENI
|        |                  /-----Ralph II De TOENI, Seigneur Of Tonsi And Conches
|        |         /-----Roger I De TOENI
|         \-----Adelise De TONI
|                  \-----Godehildie
William De BRETEUIL



Descendants of William De BRETEUIL
1. William De BRETEUIL