Nielsen Hayden genealogy
Family: Robert de Tregoz / Sibyl de Ewyas (F6365)
m. Abt 1198
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Male
Robert de Tregoz
Birth of Ewyas Harold, Herefordshire, England 
Death Bef 4 Jun 1214 Burial Marriage Abt 1198 [1, 2, 3, 4, 5] Father William de Tregoz | F4726 Group Sheet Mother
Female
Sibyl de Ewyas
Birth Death 1236 Ewyas, Herefordshire, England Burial Other Spouse Roger de Clifford | F1438 Marriage Bef 13 Feb 1217 Father Robert de Ewyas | F2967 Group Sheet Mother Pernel Scudamore | F2967 Group Sheet
Male
+ Robert de Tregoz
Birth of Ewyas Harold, Herefordshire, England Death Bef 24 Sep 1268 Burial Spouse Juliane de Cantelowe | F2011 Marriage Bef 1 Aug 1245
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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.
- [S917] John P. Ravilious, 28 Feb 2003, post to soc.genealogy.medieval.
- [S145] Ancestral Roots of Certain American Colonists Who Came to America Before 1700 by Frederick Lewis Weis and Walter Lee Sheppard, Jr. 8th edition, William R. Beall & Kaleen E. Beall, eds. Baltimore: Genealogical Publishing Company, 2004, 2006, 2008.
- [S977] The Blackmans of Knight's Creek: Ancestors and Descendants of George and Maria (Smith) Blackman by Henry James Young. Carlisle, Pennsylvania: 1980.
- [S1526] The Ancestry of Dorothea Poyntz, Wife of Reverend John Owsley, Generations 1-15, Fourth Preliminary Edition, by Ronny O. Bodine and Bro. Thomas Spalding, Jr. 2013.
- [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.