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Bibliography
  1. Keats-Rohan, K.S.B., Domesday People, A Prosopography of Persons Occurring in English Documents 1066-1166. Vol I: Domesday Book. Bury St Edmunds, Suffolk: Boydell Press, 1999. NYPL ARF 03-4178 vol 1. Corrections in Volume II (Domesday Descendants) pp 4-5. Further corrections at http://users.ox.ac.uk/~prosop/domesday-people-corrigenda.pdf Information from this source tagged as [Ref: Keats-Rohan DP p[0-9]*].

Sources for birth and parent Information
father:
[Ref: Keats-Rohan DP p424]
Research Notes:



Pedigree of William Fitz SWEIN
          /-----Robert Fitz WINMARK
 /-----Swain Of Essex, Baron Of Rayleigh
|         \-----Beatrix
William Fitz SWEIN
|                           /-----Thursten De Bastenburgh
|                  /-----Hugh With The Beard De Montfort
|         /-----Hugh De Montfort, Baron Of Haughley
 \-----(Unk Dau) De Montfort



Descendants of William Fitz SWEIN
1. William Fitz SWEIN