It seems that in the tenth century a monastery was built, as it did in other parts of the valley and passed hand to lay religious. 
the Roman church, built between the eleventh and twelfth centuries, in the opinion of different authors, maintained and dedicated to St. Pelayo and retains few elements of the original factory: the header, some corbels and cover with a curious ear drum. The interior housed the Salazar family vault. 
The eardrum is the most curious part of the cover. The figures carved on it have been interpreted in various ways, but the most convincing agree that it would be a representation of the struggle between opposites and, specifically, between good and evil. To the left of the semicircle we find a character who undergoes a lion (¿Samson?), While to the right a monstrous animal devours its victim. In between, four characters standing cross their hands in her lap. Above these seven figures angelic placed trace very simple. Jose Manuel Rodriguez Montanes in the Encyclopedia of Romanesque, tells us about “on these figures were placed other earthly angels, creating a double opposition, in the longitudinal plane, between the victory of faith over the devil and the punishment of sinner and in the vertical between the earthly and the divine. “ 
The lintel on supporting the tympanum (figure 5) has, on its front the following inscription: EGO (S) U (M) EP (L) AGIU (S) Corduba, or “I am Pelayo de Cordoba”, a reference to the martyr Cordoba who holds title to the temple. www.romanicoenruta.com/

(Translation from spanish by Google)