This monastery is situated in Plaza de la Inmaculada and was founded by a group of Benedictines who, shortly after the discovery of the Apostle's remains, settled in the place called Pignario, near the Chapel of Corticela (now part of the Cathedral), where they held their services. The main developments took place after 1494, when it came under the Benedictine Congregation of Valladolid. Thereafter the wealth they accumulated enabled them to undertake the impressive construction of the church, which, along with the Cathedral, is the most valuable building of Galicia's baroque style.
9th-18th c. Baroque. It was founded in the 11th century by Alfonso II with twelve Benedictine monks in order to look after and render worship to the recently discovered tomb of the Apostle James. The present-day construction belongs almost entirely to the 17th and 18th centuries, since the original one was demolished.
12th c. Romanesque. Built in the 12th century on the banks of the River Sar, it is the church, along with the Cathedral, that still has the greatest proportion of its original Romanesque structure.
17th c. Baroque. It was built by the Jesuits in the 17th century. It contains valuable altarpieces, with the Main Altar by Simón Rodríguez as the most outstanding one.