Castle of Gormaz

The Castle of Gormaz is notable for its extensive fortifications built primarily from masonry stone that likely includes reused materials from earlier constructions. The fortress stretches along an elongated east-to-west axis, measuring between approximately 380 and 446 meters in length, with widths varying from 17 to 63 meters. The perimeter walls extend roughly 1,200 meters and rise to about 10 meters high, reinforced by 24 to 28 towers that slightly project outward. Distinct construction styles mark the northern and southern walls: the northern side features large, rough stone blocks and a straighter alignment, while the southern wall is more curved and composed of finely carved stones, though this side has suffered greater erosion and landslides.

Two large gates provide access to the castle. The main entrance on the southwest is framed by two massive horseshoe arches spaced about 1.26 meters apart and flanked by towers. The outer arch measures 2.76 meters wide and reaches a height of 7 meters at its keystone. Historic decoration on this gate included plaster or stucco within an alfiz—a rectangular frame common in Islamic architecture—featuring possible Arabic script or geometric designs. At the eastern end of the fortress lies a heavily fortified citadel or keep. This section is separated from the larger western area by a moat and accessed through a gate with a bent entrance inside a defensive tower. Both the citadel and the main enclosure contained cisterns, which ensured water supply during sieges.

Inside the castle’s enclosure, archaeological work has identified a musalla, an open-air prayer area, distinguished by a surface covered in white mortar. In the 14th century, a small urban community inhabited the main part of the fortress, indicating its use beyond purely military functions at that time. Nearby stands the Hermitage of San Miguel de Gormaz, a chapel where a foundation stone inscribed with a mention of Caliph al-Hakam II was discovered; this stone is now housed in the nearby Burgo de Osma Cathedral.

The castle’s stones were originally painted mainly in white and red, while some Roman and Islamic stelae are embedded in the western walls. These carved stone slabs were thought to serve a protective purpose, intended to repel evil spirits. Positioned atop a hill rising about 100 meters above the Duero River, the fortress commands panoramic views of the surrounding landscape and maintains control over a bridge spanning the river, emphasizing its role as a critical defensive and administrative center throughout its history.