The church it self has a basilica plan, with three naves divided into four sections. It has a transept and sanctuary with an ambulatory opening on to five chapels, covered with barrel vaults. It is in Romanesque style, built in the 12th century under the patronage of the De Traba family. Multilobulated arches are used for the windows on the main façade. An Agnus Dei carried by angels is represented on the tympanum.