Succession
Isabella was named heir to the throne of Castile by her half brother Henry IV of Castile in the Treaty of the Bulls of Guisando. She became Queen of Castile in 1474. Her niece, Joanna of Castile, attempted to gain the throne by bringing in the foreign help of Afonso V of Portugal, leading to the War of Castilian Succession. More recently, some speculate that Joanna was the legitimate successor, though Isabella was able to portray herself as such. Isabella's supporters came out ahead in good part due to Aragon's support through Ferdinand, and she officially won in 1479 via the Treaty of Alcacovas. Ferdinand became the King of Aragon in 1479. Though their marriage united the two kingdoms, leading to the beginnings of modern Spain, they ruled independently and their kingdoms retained their own regional laws and governments for the next few centuries.
Read more about this topic: Catholic Monarchs
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