Nielsen Hayden genealogy
Family: Fernando III (St. Fernando), King Of Castile, León, Galicia, Toledo, Córdoba, Jaén, and Seville / Jeanne de Dammartin (F3808)
m. Bef 31 Oct 1237Alfonso IX, King of León and Galicia (1171-1230) 
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Alfonso (1203-1272)  |
Bérenguère of Castile-León (1204-1237) |
| Simon II de Dammartin ( -1239)
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| Marie of Ponthieu (1199-1250)
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| Philippa de Dammartin ( -1277) |
| Fernando III (St. Fernando), King Of Castile, León, Galicia, Toledo, Córdoba, Jaén, and Seville (1201-1252)
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| Jeanne de Dammartin (1220-1279)
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| Eleanor of Castile, Queen Consort of England (1240-1290) |