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 four sculptures, made of granite, represent quadrupeds identified as bulls or pigs. The balance of opinion favours bulls: there are holes which have been interpreted as sockets for horns.The Bulls of Guisando are examples of a type of ancient sculpture called verracos of which hundreds are known. They are associated with the territory of a celtiberian tribe called the Vettones. The Bulls may have been made during the 2nd century BCE. Whether they are in their original position is debatable. There are some Latin graffiti on them which may mean they were repositioned in Roman times.The field around the Bulls was the place where the Treaty of the Bulls of Guisando was signed between Henry IV of Castile and his half-sister Isabella of Castille on September 18, 1468, which granted her the title of Princess of Asturias thus ending a civil war in Castile.The Bulls are also a recurrent feature in Spanish literature. For instance, Miguel de Cervantes references them several times throughout his novel Don Quixote. Federico García Lorca uses their symbolic value in his Llanto por la muerte de Ignacio Sánchez Mejías: