Nielsen Hayden genealogy
Family: William de Lancaster / Gundred de Warenne (F2102)
m. Aft 1153-
Father | Male
William de Lancaster
Born of Kendal, Westmorland, England 
Died Bef 29 Sep 1170 Buried Married Aft 1153 [1] Other Spouse (Unknown first wife of William de Lancaster) | F5291 Married Other Spouse (Unknown mistress of William de Lancaster) | F16871 Married Father Gilbert | F80 Group Sheet Mother Godith | F80 Group Sheet
Mother | Female
Gundred de Warenne
Born Died Aft 1156 Buried Other Spouse Roger de Beaumont | F2469 Married Bef 1130 Father William II de Warenne | F4959 Group Sheet Mother Isabel de Vermandois | F4959 Group Sheet
Child 1 | Female
+ Avice de Lancaster
Born 1155 Died 1191 Buried Spouse Richard de Morville | F5321 Married
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Sources - [S142] Royal Ancestry: A Study in Colonial and Medieval Families by Douglas Richardson. Salt Lake City, 2013.
- [S142] Royal Ancestry: A Study in Colonial and Medieval Families by Douglas Richardson. Salt Lake City, 2013.