The building, also known as the Palace of the Kings of Navarre, is an example of Romanesque civil architecture, and was built in the 12th century. The old entrance to the building used to be through four large semicircular arches. There are four large windows on the first floor, with capitals adorned with plant and animal motifs. The capitals on the main façade depict scenes from Roland's fight with the giant Ferragut. The building was reopened in 1991, after being restored by the architect Miguel A. Alonso del Val. It houses the Gustavo de Maeztu Museum, which contains most of his plastic and graphic work, revolving around the female figure, portraits, still lifes and landscapes.