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King Juan I had to contend with the hostility of John of Gaunt 1st Duke of Lancaster, who claimed the crown by right of his wife Constance, the eldest daughter of Pedro of Castille. The king of Castille finally bought off the claim of his English competitor by arranging a marriage between his son Henry and Catherine, daughter of Constance and John of Gaunt in 1387.
WI John of Gaunt wasnt pacified by the marriage of his daughter to the heir of Juan I and pressed his claim harder? By starting a war perhaps? Is this possible?
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