It is a three-aisled, four-bay Gothic church with chapels between buttresses, a triforium and a polygonal choir covered by ribbed vaults. At the foot of the church is a 14th-century portal with three archivolts above which stand the Virgin and Child adored by two angels.
In the 16th century the tower was raised and a large portal was built on the epistle side, commissioned by Juan de Goyaz in 1549. It shows a complex iconographic program presided over by the Virgin Mary, as well as other scenes from the life of Christ, the Church Fathers and the Evangelists.
In the 17th and 18th centuries the cloister was added and the chapter house, the sacristy and the chapel of San Juan del Ramo were built. The latter was decorated between 1784 and 1787 by the important painter Luis Paret y Alcázar. The tempera decoration of the dome and the hanging spandrels of the chapel with scenes from the life of John the Baptist as well as the paintings The Annunciation of the Angel to Zechariah (1786) and The Visitation (1787) are Paret's greatest pictorial works. In all of these paintings, which form the last great decorative ensemble of Spanish Rococo painting, Paret reaches the pinnacle of his art (Wikipedia).