Church with a basilical floor plan, three naves and three apses, separated by semicircular formerets supported by two pillars on each side. The bellow deck is made of wood. The main nave has a triumphal arch supported by attached pillars and a semicircular barrel vault. The side apses have an arched entry and barrel vaults as well. In the south chapel there is an inscription that dates back to 1353. On the north wall there is a door with a sculpted tympanum. The stately chapel of the Deza family is attached to the southern wall, Diego Gómez de Deza (1341) is buried there. The façade is flat and has a main portal with a double archivolt supported by two pillars on each side with ornamented capitals. Over the main door there is an image of the Virgin with the baby, known popularly as “A Virxe do Leite” (The Virgin of the milk), because she is breastfeeding the baby.