Nielsen Hayden genealogy
Family: Hugh de Plessis / Isabel Biset (F3618)
m. Bef Oct 1249-
Male
Hugh de Plessis
Birth Between 1237 and 1239 of Hook Norton, Oxfordshire, England 
Death Bef 7 Jul 1292 Burial Marriage Bef Oct 1249 [1] Father John du Plessis | F70 Group Sheet Mother Christian de Saunford | F70 Group Sheet
Female
Isabel Biset
Birth Death Bef Jan 1279 Burial Hook Norton Church, Oxfordshire, England Father John Biset | F3619 Group Sheet Mother Alice Basset | F3619 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.