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A slightly random question, but I noticed that John of Gaunt, Duke of Lancaster married Constance of Castile, daughter of Peter I of Castile, and they had two kids: Catherine born in 1372, who would later go on to marry Henry III of Castile, and John born in 1374 who died in 1375. Now John waged a war with Henry for the throne of Castile. Eventually he ended his pretensions and agreed to marry his daughter to Henry. If his son John survives, would he continue with his pretensions or give up as he did otl? Regardless, what title could John the younger be given as an English noble, and who could he potentially marry?
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