Pact of Los Toros de Guisando
Quick Summary
The Pact of Los Toros de Guisando, signed in 1468, was an agreement between King Henry IV of Castile and his half-sister Isabella. This pact recognized Isabella as the heir to the Castilian throne, effectively disinheriting Henry's daughter, Joan, who was rumored to be illegitimate. This agreement was a significant step towards the eventual union of Castile and Aragon, as Isabella later married Ferdinand of Aragon in 1469, leading to their joint rule and the formation of modern Spain. The pact aimed to resolve a succession crisis and stabilize the kingdom amidst internal conflicts and challenges from the nobility.12
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