Nielsen Hayden genealogy
Family: Robert II de Bellême / Agnes de Ponthieu (F5915)
m. Bef 9 Sep 1087-
Male
Robert II de Bellême
Birth 1057 Sées, Orne, Normandy, France 
Baptism 1057 Sées, Orne, Normandy, France Death Aft 1129 Burial Marriage Bef 9 Sep 1087 [1] Father Roger de Montgomery | F1554 Group Sheet Mother Mabel de Bellême | F1554 Group Sheet
Female
Agnes de Ponthieu
Birth Death Aft 1100 Burial Father Guy I | F6210 Group Sheet Mother Ada | F6210 Group Sheet
Male
+ Guillaume III Talvas
Birth Abt 1093 of Alençon, Orne, Basse-Normandie, France Death 30 Jun 1171 Burial Spouse Helie of Burgundy | F363 Marriage Abt 1115
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Notes - Date of arrangement. According to the Oxford Dictionary of National Biography, the actual marriage may not have taken place until about 1092.
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Sources - [S128] The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct or Dormant ed. Vicary Gibbs, H. A. Doubleday, Duncan Warrand, Howard de Walden, Geoffrey H. White and R. S. Lea. 2nd edition. 14 volumes (1-13, but volume 12 spanned two books), London, The St. Catherine Press, 1910-1959. Volume 14, "Addenda & Corrigenda," ed. Peter W. Hammond, Gloucestershire, Sutton Publishing, 1998.
- [S128] The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct or Dormant ed. Vicary Gibbs, H. A. Doubleday, Duncan Warrand, Howard de Walden, Geoffrey H. White and R. S. Lea. 2nd edition. 14 volumes (1-13, but volume 12 spanned two books), London, The St. Catherine Press, 1910-1959. Volume 14, "Addenda & Corrigenda," ed. Peter W. Hammond, Gloucestershire, Sutton Publishing, 1998.