A church which took on great importance

The lower section of the church dates from the early 13th century. The upper section of the church dates from the 14th century, while the cloister dates from the 15th century, although they have seen major reforms.

The building has three naves with four sections. The sanctuary has three polygonal chapels. The cross vault has ogival vaults on cross-shaped pillar columns. The cloister is square with pointed arcades. There is no decoration. The inside houses the mausoleum of Menéndez Pelayo, designed by Victorio Macho.