Nielsen Hayden genealogy
Family: Pedro I, King of Castile / Maria García de Padilla (F13167)
m. 1353Alfonso XI, King of Castile and Leon (1311-1350) 
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Maria of Portugal (1313-1357)
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| Juan Garcia de Padilla ( -1351)
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| Maria González de Henestrosa ( -1355)
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| Pedro I, King of Castile (1334-1369)
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| Maria García de Padilla (1335-1361)
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Constance of Castile (1354-1394)  |
| Isabella of Castile (1355-1392) |