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From her precarious position in the line of succession to the chaotic reign of her half-brother, a series of factors and events not only fueled her ambition but also necessitated the strategic and pivotal union with Ferdinand of Aragon.
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Isabella I of Castile's half brother was Henry IV of Castile. He became king after their father, John II of Castile, died when Isabella was a child. Henry IV's reign and his relationship with Isabella played a crucial role in shaping her path to the throne