Built on a previous building;the church was consecrated in 1170;as a memorial plaque on the right wall of the nave records.The apse and the right arm of the transept;where architectural fragments from Amiternum were walled;belong to the former building.The structure is at Latin cross with a single long nave.The apse is decorated with thirteenth-century frescoes;attributed to the Master of San Silvestro;the transept before it is as long as the nave.