Nielsen Hayden genealogy
William de Willoughby
- 1227-
Name William de Willoughby Birth of Sloothby in Willoughby in the Marsh, Lincolnshire, England 
[1] Gender Male Death Between 1225 and 1227 [1] Person ID I13683 Ancestry of PNH, TNH, and others | Ancestor of DDB, Ancestor of JTS, Ancestor of LD, Ancestor of TSW, Ancestor of TWK Last Modified 30 Apr 2018
Family Maud de Fulletby Children + 1. Robert de Willoughby d. Between 3 Feb 1257 and 21 Feb 1258 Family ID F8569 Group Sheet | Family Chart Last Modified 30 Apr 2018
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Notes - CP states that his parentage is unknown.
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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.