Church with a basilica style layout, with three naves separated by columns. Chevet with three semi-cylindrical apses. Square bell tower, forming part of the main building. Sculptural ornamentation on the exterior of the apses and bell tower with "saw tooth" frieze, blind arcades and pilaster strips. The whole interior of the temple was originally decorated with painted murals, but these were removed between 1919 and 1923, and are now conserved at the Museu Nacional d'Art de Catalunya (MNAC) in Barcelona. The scenes depicting Judgement Day and Hell and those in the central apse showing a standing figure of the Virgin and Child, the Apostles and the animals of the Bestiary, are all of particular interest. The church was consecrated on 11th December 1123.

On 30th November 2000, this church was declared a UNESCO World Heritage Site as part of the Catalan Romanesque ensemble of the Vall de Boí (Alta Ribagorça - Spain).