Nielsen Hayden genealogy
Family: William de Ferrers / Sybil Marshal (F444)
m. Bef 14 May 1219-
Father | Male
William de Ferrers
Born Abt 1193 of Tutbury, Burton-on-Trent, Staffordshire, England 
Died 24 Mar 1254 Evington, Leicestershire, England 
Buried 31 Mar 1254 Merevale Abbey, Warwickshire, England 
Married Bef 14 May 1219 [1, 2, 3, 4] Other Spouse Margaret de Quincy | F6338 Married Bef 1239 Father William de Ferrers | F3280 Group Sheet Mother Agnes of Chester | F3280 Group Sheet
Mother | Female
Sybil Marshal
Born Abt 1204 Died Bef 1238 Buried Father William Marshal | F5382 Group Sheet Mother Isabel de Clare | F5382 Group Sheet
Child 2 | Female
+ Joan de Ferrers
Born Died Bef Oct 1267 Buried Spouse Robert Aguillon | F2106 Married Spouse John de Mohun | F16672 Married Aft 1245
Child 5 | Female
Eleanor de Ferrers
Born Died Bef 26 Oct 1274 Buried 26 Oct 1274 Spouse Roger de Quincy | F426 Married
Child 7 | Female
+ Sibyl de Ferrers
Born Died Bef 1260 Buried Spouse Frank de Bohun | F11673 Married Bef 21 Sep 1247
Child 8 | Female
+ Maud de Ferrers
Born Abt 1230 Died 12 Mar 1299 Buried Spouse William de Forz | F791 Married Abt 30 Jul 1248
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Sources - [S142] Royal Ancestry: A Study in Colonial and Medieval Families by Douglas Richardson. Salt Lake City, 2013.
- [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.
- [S145] Ancestral Roots of Certain American Colonists Who Came to America Before 1700 by Frederick Lewis Weis and Walter Lee Sheppard, Jr. 8th edition, William R. Beall & Kaleen E. Beall, eds. Baltimore: Genealogical Publishing Company, 2004, 2006, 2008.
- [S1016] Medieval English Ancestors of Robert Abell by Carl Boyer III. Santa Clarita, California, 2001.
- [S142] Royal Ancestry: A Study in Colonial and Medieval Families by Douglas Richardson. Salt Lake City, 2013.