Nielsen Hayden genealogy
Family: Gilbert de Knovil / Margaret de Hydon (F22415)
m. Bef 24 Jan 1309-
Male
Gilbert de Knovil
Birth of Batteshorne, Devon, England 
Death 20 Jan 1314 Burial Marriage Bef 24 Jan 1309 [1] Other Spouse (Unknown first wife of Gilbert de Knovil) | F22416 Marriage Father Mother
Female
Margaret de Hydon
Birth Death 15 May 1357 Burial St. Katherine's Chapel, Hemyock, Devon, England Other Spouse Josce de Dinham | F16678 Marriage Between 12 Apr 1288 and 23 Apr 1292 Father Richard de Hydon | F16679 Group Sheet Mother Isabel de Fissacre | F16679 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.