The construction of the church was ordered by King Silo of Asturias. It was built from 774 to 783, and was remodelled in the 17th and 18th centuries. It has a basilica-type floor plan with three naves separated by pillars and a square apse. The columns of the triumphal arch and part of the decoration are conserved from the original building. The main body of the church has a flat wooden ceiling.