Nielsen Hayden genealogy
Family: Richard of Cornwall, King of the Romans / Sancie (F878)
m. 23 Nov 1243-
Father | Male
Richard of Cornwall, King of the Romans
Born 5 Jan 1209 Winchester Castle, Hampshire, England 
Died 2 Apr 1272 Berkhamsted, Hertfordshire, England Buried Hailes Abbey, Gloucestershire, England Married 23 Nov 1243 [1] Westminster Abbey, Westminster, Middlesex, England [1] Other Spouse Joan | F1235 Married Other Spouse (Unknown mistress of Richard of Cornwall) | F16965 Married Other Spouse Isabel Marshal | F917 Married 30 Mar 1231 Fawley, Buckinghamshire, England Father John, King of England | F1256 Group Sheet Mother Isabel of Angoulême, Queen Consort of England | F1256 Group Sheet
Mother | Female
Sancie
Born Died 9 Nov 1261 Buried Hailes Abbey, Gloucestershire, England Father Raymond Berenger | F2575 Group Sheet Mother Beatrice of Savoy | F2575 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.