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TheTreaty of the Bulls of Guisando (Spanish:Tratado de los Toros de Guisando) is the name of atreaty agreed on top of the hill of Guisando near theBulls of Guisando (located inÁvila,Spain) on 19 September 1468, betweenHenry IV of Castile and his half-sisterIsabella of Castile.[1][2][3] The treaty granted Isabella the title ofPrincess of Asturias and so she became heiress presumptive to theCrown of Castile.
A civil war began in Castile in 1464 when a group of noblemen rebelled in an attempt to force the abdication of Henry IV. By 1465 they had symbolically dethroned the King and replace him with his half-brotherAlfonso. With the death of Alfonso, in 1468, Isabella the half-sister of Henry IV, became the new candidate of the rebels. Rather than continuing the civil war, Isabella preferred to negotiate with Henry IV sendingAntonio de Veneris [es] as mediator.
After several meetings inCastronuevo a preliminary agreement was reached that would put an end to the civil war. The agreement was formalized in the Treaty of the Bulls of Guisando on 18 September 1468. With the treaty, the allegiance of the wholeKingdom of Castile was to return to the King and Isabella was to become his heiress presumptive, receive the title of Princess of Asturias as well as a large endowment. Isabella was to marry only with the consent of the King. Finally,Joanna, the King's daughter, was removed from the line of succession to the throne through the annulment of Henry's marriage to his wife.
Later, the unapproved wedding of Isabella withFerdinand of Aragon caused Henry IV to shun the treaty. As a consequence the King recognized once more the rights of his daughter Joanna in aceremony [es] that took place inVal de Lozoya [es] on 25 November 1470. This was one of the events that eventually led to theWar of the Castilian Succession a few years later.
