Nielsen Hayden genealogy
Family: Robert de Ros / Sybil de Valognes (F818)
m. Bef 1145
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Male
Robert de Ros
Birth of Helmsley, Yorkshire, England 
Death 1162 Burial Marriage Bef 1145 [1] Father Piers de Ros | F2474 Group Sheet Mother Adeline Espec | F2474 Group Sheet
Female
Sybil de Valognes
Birth Death Aft 1212 Burial Nun Appleton Priory, Yorkshire, England Other Spouse William de Percy | F1537 Marriage Between 1164 and 1166 Father Roger de Valognes | F3632 Group Sheet Mother Agnes fitz John | F3632 Group Sheet
Male
+ Everard de Ros
Birth Bef 1146 of Helmsley, Yorkshire, England Death Bef 29 Sep 1183 Burial Spouse Roese Trussebut | F4010 Marriage
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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.