Nielsen Hayden genealogy
Family: William de Percy / Joan Briwerre (F1336)
m. Abt 1226-
Father | Male
William de Percy
Born Abt 1193 of Topcliffe, Yorkshire, England 
Died Bef 28 Jul 1245 Buried Sallay Abbey, Yorkshire, England 
Married Abt 1226 [1] Other Spouse Ellen de Balliol | F1326 Married Abt 1233 Father Henry de Percy | F1381 Group Sheet Mother Isabel de Brus | F1381 Group Sheet
Mother | Female
Joan Briwerre
Born Died Bef 12 Jun 1233 Buried Hospital of Sandon, Surrey, England 
Father William de Briwerre | F1306 Group Sheet Mother Beatrice de Vaux | F1306 Group Sheet
Child 1 | Female
+ Anastasia de Percy
Born Died Bef 28 Apr 1272 Buried Spouse Ralph fitz Ranulph | F2182 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.