Nielsen Hayden genealogy
Family: Reynold de Briouze / Gwladus Ddu (F1970)
m. 1215-
Father | Male
Reynold de Briouze
Born of Abergavenny, Monmouthshire, Wales 
Died Between 1227 and 1228 Buried Married 1215 [1] Other Spouse Grace Briwerre | F6152 Married Father William de Briouze | F2352 Group Sheet Mother Maud de St. Valéry | F2352 Group Sheet
Mother | Female
Gwladus Ddu
Born Died 1251 Windsor, Berkshire, England Buried Other Spouse Ralph de Mortimer | F3387 Married Bef 26 Oct 1230 Father Llywelyn Fawr ap Iorwerth | F2856 Group Sheet Mother Joan of England | F2856 Group Sheet
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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.