Accord of Toros de Guisando

The Accord of the Toros de Guisando was a significant agreement in Spanish history, primarily concerning the succession to the throne of Castile. It was signed in 1468 between King Henry IV of Castile and his half-sister, Isabella.

The accord recognized Isabella as the heir to the Castilian throne, effectively disinheriting Henry IV's daughter, Joan, who was known as "La Beltraneja." This agreement was a pivotal moment in the lead-up to the War of the Castilian Succession and the eventual unification of Spain under the Catholic Monarchs, Ferdinand II of Aragon and Isabella I of Castile.123