During the Middle Ages, Santo Tomé was linked to the Archbishopric of Toledo and was part of the territory of the Advancement of Cazorla. To meet the defensive objectives, a castle was built in the 14th century of which only the keep remains, with a rectangular base, almost square and with a single floor, which managed to be preserved by being incorporated as a bell tower on the left side of the church . The tower, which retains its Gothic features, is made of masonry and regular courses on the ground floor and ashlar on the upper area, and is covered by a roof. When the original military function was changed to the religious one, a stone belfry was added with two holes for the bells, cornice and triangular pediment that houses another bell. It was declared an Asset of Cultural Interest in 1985.