Nielsen Hayden genealogy
Family: Sancho IV, King of Castile and León / Maria de Molina (F15154)
m. 1281Alfonso X, King of Castile and León (1221-1284) 
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Yolande of Aragón (1237-1301)
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| Alfonso (1203-1272)
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| Sancho IV, King of Castile and León (1258-1295)
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| Maria de Molina (1262-1321)
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Fernando IV, King of Castile (1285-1312)  |
| Beatriz of Castile (1293-1359) |