Nielsen Hayden genealogy
Family: Maurice de Berkeley / Isabel fitz Richard (F3864)
m. Bef 12 Jul 1247
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Male
Maurice de Berkeley
Birth 1218 of Berkeley, Gloucestershire, England 
Death 4 Apr 1281 Burial Abbey Church of St. Augustine, Bristol, Gloucestershire, England Marriage Bef 12 Jul 1247 [1, 2] Father Thomas de Berkeley | F251 Group Sheet Mother Joan de Somery | F251 Group Sheet
Female
Isabel fitz Richard
Birth Death 7 Jul 1276 Burial Abbey Church of St. Augustine, Bristol, Gloucestershire, England Father Richard fitz Roy | F4059 Group Sheet Mother Rohese de Douvres | F4059 Group Sheet
Male
+ Thomas de Berkeley
Birth of Berkeley, Gloucestershire, England Death 23 Jul 1321 Berkeley, Gloucestershire, England Burial Abbey Church of St. Augustine, Bristol, Gloucestershire, England Spouse Joan de Ferrers | F4196 Marriage 1267
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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.
- [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.