It was built in the last quarter of the 12th century,[citation needed] in a late Romanesque style.

[citation needed] The Mier family, who had historically financed San Pedro, stopped their funding in 1778.

They are decorated with plant motifs, human figures and various fantastic creatures (mermaids, griffins and centaurs).

On the right is a small window divided with an arrow, which is framed by a checkered dust cover and a molded and a five lobed archivolt arc.

The straight section preceding the apse runs under a covered arcade with three columns on each side, and the remaining two small bases.