Almansa Castle is located in this Spanish municipality in the province of Albacete, in the autonomous region of Castile-La Mancha.

The original construction may have corresponded to the Almohads, who used to use the rammed-earth technique for their defensive constructions. However, the remains of the rammed-earth walls preserved in this castle, traditionally interpreted as coming from the Almohad period, were built during the first decades of Christian rule, in the late 13th or early 14th century, as demonstrated by the various analyses carried out in 2008 during its restoration.

In the 14th century the fortress passed into the hands of the Infante Don Juan Manuel, who, taking advantage of the previous construction, had some of its elements and walls rebuilt. This is indicated by a number of documents published by Aurelio Pretel. In one of them, from 1338, on the use of water from Alpera, several penalties are established which, in whole or in part, were to be used for the castle of Almansa.

Juan Pacheco, 2nd Marquis of Villena, gave the current morphology to the castle of Almansa, with the construction of the keep, the semicircular towers of the walls and the defensive barbican. His coat of arms appears on the keystones of the simple ribbed vaults and on the four outer faces of the keep, built between 1449 and 1454, a time frame that could be extended to all of Don Juan Pacheco's works.

From the 16th century onwards, the castle entered a long process of abandonment and deterioration due to disuse, as it lost its function as a defensive bastion of the municipality. Such was the deterioration and devaluation of the monument that in 1919 the Mayor of Almansa denounced the ruinous state of the castle and requested permission for its demolition.

Thanks to the reports produced by the Royal Academy of History and the Royal Academy of Fine Arts of San Fernando, against the request of the Town Council, the castle of Almansa was not only saved, but also, by Royal Order of 2 February 1921, declared a National Historic-Artistic Monument. Identifier of the property granted by the Ministry of Culture: RI-51-0000190.

In 1952 the monument entered a continuous process of restoration, reconstruction and revaluation as a historical and touristic element of Almansa, which is currently continuing under the guidelines set out in the "Master Plan for the Castle of Almansa" and the "Cerro del Águila Project", which were drawn up and are being followed so that the various restoration works do not cause the visitor to the monument to lose sight of the castle as a defensive bastion of the municipality.