The collegiate church of San Cosme and San
Damián was built from a previous Romanesque church. The
new one is from the XV century and is Gothic in style. It has
a Latin cross floor plan and three naves and Galician cross. In
the presbytery the count of Fernán González and
his wife Doña Sancha can be found, a Hispanic-Roman tomb
from the IV century.
In the cloister is the Gothic tomb of princess Cristina de Noruega, first wife of prince Felipe, brother of Alfonso X the Wise. Worthy of note in the church is the main Baroque reredo and organ from the XVII century.
There are a great variety of reglious works of art: Romanesque capitals, panels by Berruguete, Van Eyck, precious metalwork by the famous master Calahorra, liturgical vestments from the XVI to XVIII century and the extraordinary triptych of the Adoration of the Magi, anonymous carving but with clear Flemish influence.