King Juan I of Castile (d. 1390)
Juan or John I of Castile (1358 - 1390), son of Henry of Trastámara and Juana Manuel of Castile. He married (1) Eleanor of Aragon, daughter of Pere IV, king of Aragon, in 1375 (2) Beatrice of Portugal, daughter of king Ferdinand I of Portugal. Juan succeeded the throne of Castile in 1379 until 1390, taking the title "Juan I".
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