Treaty of the Bulls of Guisando
Encyclopedia
The Treaty of the Bulls of Guisando is the name of a treaty
Treaty
A treaty is an express agreement under international law entered into by actors in international law, namely sovereign states and international organizations. A treaty may also be known as an agreement, protocol, covenant, convention or exchange of letters, among other terms...

 agreed on top of the hill of Guisando near the Bulls of Guisando
Bulls of Guisando
The Bulls of Guisando are a set of celtiberian sculptures located on the hill of Guisando in the municipality of El Tiemblo, Ávila, Spain. The sculptures, made of granite, represent quadrupeds identified as bulls or pigs...

 (located in El Tiemblo
El Tiemblo
El Tiemblo is a municipality located in the province of Ávila, Castile and León, Spain. According to the 2006 census , the municipality has a population of 4,071 inhabitants.]...

, Ávila
Ávila (province)
Ávila is a province of central-western Spain, in the southern part of the autonomous community of Castile and León. It is bordered on the south by the provinces of Toledo and Cáceres, on the west by Salamanca, on the north by Valladolid, and on the east by Segovia and Madrid. Ávila has a...

, Spain
Spain
Spain , officially the Kingdom of Spain languages]] under the European Charter for Regional or Minority Languages. In each of these, Spain's official name is as follows:;;;;;;), is a country and member state of the European Union located in southwestern Europe on the Iberian Peninsula...

) on September 18, 1468, between Henry IV of Castile
Henry IV of Castile
Henry IV , King of the Crown of Castile, nicknamed the Impotent , was the last of the weak late medieval kings of Castile...

 and his half-sister Isabella of Castile
Isabella I of Castile
Isabella I was Queen of Castile and León. She and her husband Ferdinand II of Aragon brought stability to both kingdoms that became the basis for the unification of Spain. Later the two laid the foundations for the political unification of Spain under their grandson, Charles V, Holy Roman Emperor...

. In this treaty Isabella was granted the title of Princess of Asturias
Princess of Asturias
This is a list of women who held the title Princess of Asturias by marriage.The title was created in 1388 for the future Henry III of Castile and Catherine of Lancaster. A part of the pact was to gran the young couple the title of Prince and Princess of Asturias, which was modelled after that of...

 and therefore became heiress presumptive to the Crown of Castile
Crown of Castile
The Crown of Castile was a medieval and modern state in the Iberian Peninsula that formed in 1230 as a result of the third and definitive union of the crowns and parliaments of the kingdoms of Castile and León upon the accession of the then King Ferdinand III of Castile to the vacant Leonese throne...

.

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 managed to symbolically dethrone the King and replace him with his half-brother Alfonso. 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 sending Antonio de Veneris as mediator.

After several meetings in Castronuevo
Castronuevo
Castronuevo is a municipality located in the province of Zamora, Castile and León, Spain. According to the 2009 census , the municipality has a population of 312 inhabitants....

 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 September 18, 1468. With the treaty the allegiance of the whole Kingdom of Castile
Kingdom of Castile
Kingdom of Castile was one of the medieval kingdoms of the Iberian Peninsula. It emerged as a political autonomous entity in the 9th century. It was called County of Castile and was held in vassalage from the Kingdom of León. Its name comes from the host of castles constructed in the region...

 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 on the unapproved wedding of Isabella with Ferdinand of Aragon
Ferdinand II of Aragon
Ferdinand the Catholic was King of Aragon , Sicily , Naples , Valencia, Sardinia, and Navarre, Count of Barcelona, jure uxoris King of Castile and then regent of that country also from 1508 to his death, in the name of...

 caused Henry IV to shun the Treaty. As a consequence the King recognized once more the rights of his daughter Joanna in a ceremony that took place in Val de Lozoya on November 25, 1470. This was one of the events that eventually led to the War of the Castilian Succession
War of the Castilian Succession
The War of the Castilian Succession was the military conflict contested from 1475 to 1479 for the succession of the Crown of Castile fought between the supporters of Juana la Beltraneja, daughter of the late monarch Henry IV of Castile, and those of Henry's half sister, Isabella, who was ultimately...

a few years later.
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