Records on the church of St. Peter go no further than the mid-seventeenth century: in 1843 Vittorio Angius reported that the church was built in 1661 next to the church of St. Michael the Archangel “which was the old parish church.” The parish church of San Pietro, in a dominant position with respect to the historic center, is located at the summit of the relief on which Neoneli stands. The building, which faces an irregularly shaped churchyard accessible by two flights of steps, has an elevation with a masonry face made of cantons of red and purplish-brown trachyte of medium and coarse size and accurate cut. The late Gothic layout is already evident from the facade, set according to a quadrangular module with a flat finial crowned by trident battlements and at the center of which, in axis with the portal, is the large rose window. Immediately below the rose window is carved in bas-relief a rosette decoration. To the left of the facade and in axis with it stands the square-plan bell tower, in the third order of which a pointed arch window opens in each side. In the central field of the lower register opens the low-slung portal-the result of a 19th-century remodeling-above which is inserted a tile in which the keys of St. Peter are carved. The persistence of the late Gothic language also characterizes the articulation of the interior space of the church: a single-nave hall marked in four bays by cruciform pillars, connected by large arches to four chapels on each side, with the exception of the first on the left, under the bell tower, reduced to a baptistery niche. Closing the nave is the deep chancel on the right side of which is a small square-plan room with a groined and ribbed vault in the most typical late Gothic tradition. The hall is barrel-vaulted and reinforced by sub-arches interrupted by a molded cornice that runs around the entire inner perimeter of the building; the side chapels, on the other hand, made communicating with each other by the opening of round arches in the wall partitions, face the hall through pointed arches. Exceptions are the two chapels closest to the chancel, which were transformed in 1886 into a pseudotransept, giving the building its classic Latin cross shape. In the parish church of St. Peter, many valuable furnishings are preserved: the marble high altar, wooden and trachyte altars, an ancient wooden pulpit with paravo, numerous wooden statues, etc.
