Built in the 11th century, this Romanesque chapel was stripped of its sacred objects and religious ledgers during an incursion of the Turks who then burnt and destroyed it. Its only nave has been consolidated with what little was left of the ruins.
Several attempts have been made to restore and consolidate it, which has not been easy since the chapel was seriously damaged by the transformations it underwent around the 17th century (apse cut off, extended nave). There is an "arca" inside, as evidenced by the marble plaque on which is engraved "ANNO 1686 DEL MONTICELLO". There are also funeral plaques of the oldest inhabitants of Monticello.