Romanesque church with a single nave, covered by a pointed barrel vault framed by two transverse arches. The apse, located to the east, is semicircular in plan and slightly offset to the south from the nave's axis. It opens to the nave through a pointed arch and is lit by two splayed windows. The main entrance is on the south wall, with a semicircular arch doorway featuring large voussoirs, probably of modern construction. There are signs of a former porch attached to the south wall. Another doorway exists at a higher level next to the bell tower, which is attached to the west wall, slightly off-center to the north. The bell tower is square in plan and crowned by two levels with openings and a pyramidal roof framed by four pinnacles. The windows of the bell tower, built with toba stone blocks, are twin-arched and connected by a small column, also made of toba, embedded into the tower walls. The ancient name of the church, “Santa Maria de Kastro Veteri,” suggests an early origin, referencing a castle that was already considered old by the 10th century. The first documented mention of the church dates to 942.