Following recent work carried out in the church of the Most Holy Trinity, some epigraphs and a fresco depicting an Enthroned Majesty dating to the 14th century were brought to light. The original structure probably had a different layout from the current 19th-century one, rebuilt after 1872 following the disastrous earthquake of 1857: from the testimonies of Viggiano and Riviello, who saw the medieval building, it can be hypothesized that the temple had a Romanesque layout with three naves, similar to that of the church of S. Michele, but with a truss roof in the center and cross vaults in the side naves. Work resumed again only in 1872. The building shows a single-nave layout with chapels, a coffered ceiling, a short transept and a semicircular apse. The current forms of the apse are the result of interventions carried out in the fascist era and in the post-war period. The only surviving part of the original complex is today recognizable in the two remaining registers of the bell tower.