Nielsen Hayden genealogy
Family: William Comyn / Margaret of Buchan (F3334)
m. Abt 1210-
Male
William Comyn
Birth Death 1233 Burial Marriage Abt 1210 [1, 2] Other Spouse (Unknown first wife of William Comyn) | F16299 Marriage Father Richard Comyn | F1412 Group Sheet Mother Hextilda of Tynedale | F1412 Group Sheet
Female
Margaret of Buchan
Birth Death Between 8 Apr 1242 and 31 Dec 1243 Burial Father Fergus of Buchan | F5858 Group Sheet Mother
Male
+ Alexander Comyn
Birth of Buchan, Aberdeenshire, Scotland 
Death Bef 6 Apr 1290 Burial Spouse Elizabeth de Quincy | F4680 Marriage
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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.
- [S1016] Medieval English Ancestors of Robert Abell by Carl Boyer III. Santa Clarita, California, 2001., "no later than 1214".
- [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.