Nielsen Hayden genealogy
Family: Thomas de Berkeley / Joan de Somery (F251)
m. Abt 1217-
Male
Thomas de Berkeley
Birth Abt 1170 Death 29 Nov 1243 Burial Abbey Church of St. Augustine, Bristol, Gloucestershire, England 
Marriage Abt 1217 [1] Father Maurice fitz Robert fitz Harding | F4859 Group Sheet Mother Alice de Berkeley | F4859 Group Sheet
Female
Joan de Somery
Birth Death Aft 1273 Burial Father Ralph de Somery | F5853 Group Sheet Mother Margaret le Gras | F5853 Group Sheet
Male
+ Maurice de Berkeley
Birth 1218 of Berkeley, Gloucestershire, England Death 4 Apr 1281 Burial Abbey Church of St. Augustine, Bristol, Gloucestershire, England Spouse Isabel fitz Richard | F3864 Marriage Bef 12 Jul 1247
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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.