The Mendoza's entered to the service of the kingdom of Castile during the reign of Alfonso XI (1312-1350).

Before the Mendoza's went to Castile, Álava was a battlefield, in which the lordly families resolved their fights over generations.

He participated in the Battle of Las Navas de Tolosa in 1212 and for having contributed to the breaking of the siege of the chains that guarded the store of Almohade, Muhammad al-Nasir (Miramamolin) (1199-1213), added to his coat of arms a border with chains.

The Dukes of the Infantado maintained possession of the Tower of Mendoza until its 1856 sale to the Victorian Bruno Martinez of Aragon and Fernandez de Gamboa.

The top floor is finished with a cover or roof to avoid water entering the castle.