Nielsen Hayden genealogy
Family: Simon II de Dammartin / Marie of Ponthieu (F3037)
m. Sep 1208-
Father | Male
Simon II de Dammartin
Born Died 21 Sep 1239 Buried Abbey de Valloires, Abbeville, Somme, Picardy, France 
Married Sep 1208 [1] Father Aubrey II de Dammartin | F4849 Group Sheet Mother Mahaut of Clermont | F4849 Group Sheet
Mother | Female
Marie of Ponthieu
Born 17 Sep 1199 Died Sep 1250 Abbeville, Somme, Picardy, France 
Buried Father William II Talvas | F4827 Group Sheet Mother Alix of France | F4827 Group Sheet
Child 1 | Female
+ Philippa de Dammartin
Born Died Between 14 Apr 1277 and 1281 Buried Spouse Otto II van Gelre | F14666 Married 1253
Child 2 | Female
+ Jeanne de Dammartin
Born Abt 1220 Died 15 Mar 1279 Abbeville, Somme, Picardy, France 
Buried Abbey de Valloires, Abbeville, Somme, Picardy, France 
Spouse St. Fernando III, King Of Castile, León, Galicia, Toledo, Córdoba, Jaén, and Seville | F3808 Married Bef 31 Oct 1237 Burgos, Castile, Spain 
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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.