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Bibliography
  1. Ravilious, John, de Birkin of Laxton, co. Notts.. Posting to soc.genealogy.medieval (email list GEN-MEDIEVAL) on 9/22/2004. Subject: de Birkin of Laxton, co. Notts.. Available at https://groups.google.com/g/soc.genealogy.medieval/c/PWtMTHeuKBc/m/HZo1hSrO3fYJ. Author address: Therav3 at aol dot com. Information from this source tagged as [Ref: John Ravilious SGM 9/22/2004-192932].

Sources for birth and parent Information
parents:
[Ref: John Ravilious SGM 9/22/2004-192932]
Research Notes:



Pedigree of William De BIRKIN
                   /-----Essulf
          /-----Peter FITZ ESSULF
 /-----Adam FITZ PETER
|         \-----Emma De LASCELLES
William De BIRKIN
|                                             /-----Halselin
|                                    /-----(Unk)
|                           /-----Ralph De CALZ
|                  /-----Robert De CALZ
|                 |         \-----(Unk)
|         /-----Robert De CAUZ
|        |        |                           /-----Walkelin De FERRIERES
|        |        |                  /-----Henry De FERRERS, Baron Of Tutbury
|        |        |         /-----Robert FERRERS, Earl Of Derby
|        |        |        |         \-----Bertha
|        |         \-----Isabel FERRERS
|        |                 |                                    /-----Rivallon The Vicaire
|        |                 |                           /-----Triscan
|        |                 |                          |         \-----Guenergant Vicountess Of Rennes
|        |                 |                  /-----Robert I Princeps Of Vitre
|        |                 |                 |         \-----Enoguen
|        |                 |         /-----Andre I De Vitre
|        |                 |        |        |                  /-----Suthardus Vetulus De CREDONE
|        |                 |        |        |         /-----Guerin I De CRAON
|        |                 |        |         \-----Bertha Dame De Craon
|        |                  \-----Hawise
|        |                          |                  /-----Herluin De Contreville
|        |                          |         /-----Robert De Mortain, Count Of Mortain In Avranchi
|        |                          |        |        |         /-----Fulbert Of Falaise
|        |                          |        |         \-----Herleve Of Falaise
|        |                          |        |                  \-----Duxia
|        |                           \-----Agnes Of Mortain
|        |                                   |                  /-----Roger De Montgomery, Seigneur Of Montgomery
|        |                                   |         /-----Roger De Montgomery, Earl Of Shrewsbury
|        |                                   |        |         \-----Emma
|        |                                    \-----Maud De Montgomery
|        |                                            |         /-----William II TALVAS
|        |                                             \-----Mabel De Belesme
|        |                                                      \-----Hildeburg
 \-----Maud De CAUZ
         |                  /-----Ralph BASSET
         |         /-----Richard BASSET, Justiciar Of England
          \-----Sibil BASSET
                  |                  /-----(Unk) RIDEL
                  |         /-----Geoffrey RIDEL
                   \-----Maud RIDEL
                           |                                    /-----Ansfred Le Goz, Vicomte De Hiesmer
                           |                           /-----Turstain De Goz, Vicount Of Hiemois
                           |                  /-----Richard Le Goz, Vicomte D'Avranches
                           |         /-----Hugh Earl Palatine Of Chester
                           |        |         \-----Emma
                            \-----Geva Of Chester



Descendants of William De BIRKIN
1. William De BIRKIN