John I (August 24, 1358 – October 9, 1390) was the king of Castile, was the son of Henry II and of his wife Juana Manuel of Castile, daughter of Juan Manuel, Duke of Penafiel, head of a younger branch of the royal house of Castile. His first marriage, with Eleanor of Aragon on June 18, 1375, produced most of his issue, including the future Kings Henry III of Castile and Ferdinand I of Aragon.
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