Nielsen Hayden genealogy
Family: Guillaume de Fiennes / Blanche de Brienne (F10536)
m. Between 18 Jan 1266 and Feb 1267-
Father | Male
Guillaume de Fiennes
Born of Wendover, Buckinghamshire, England 
Died 11 Jul 1302 Kortrijk, Flanders 
Buried Married Between 18 Jan 1266 and Feb 1267 [1] Father Enguerrand de Fiennes | F10836 Group Sheet Mother (Unknown) de Condé | F10836 Group Sheet
Mother | Female
Blanche de Brienne
Born Died Buried Father Jean de Brienne | F10537 Group Sheet Mother Jeanne de Châteaudun | F10537 Group Sheet
Child 1 | Female
+ Margaret de Fiennes
Born Died 7 Feb 1344 Buried Spouse Edmund de Mortimer | F10535 Married Bef 12 Dec 1285
Child 2 | Female
+ Joan de Fiennes
Born Died Bef 26 Oct 1309 Buried Spouse John Wake | F10075 Married Bef 24 Aug 1291
Child 3 | Male
+ Jean de Fiennes
Born Died Aft 1324 Buried Spouse Isabelle de Dampierre | F15171 Married 1307
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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.