Nielsen Hayden genealogy
Family: Alfonso XI, King of Castile and Leon / Maria of Portugal (F13168)
m. Sep 1328Fernando IV, King of Castile (1285-1312) 
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Costanza of Portugal (1290-1313)
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| Afonso IV, King of Portugal (1291-1357)
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| Beatriz of Castile (1293-1359)
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| Alfonso XI, King of Castile and Leon (1311-1350)
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| Maria of Portugal (1313-1357)
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Pedro I, King of Castile (1334-1369)  |