The ancient Romanesque church is dedicated to the town’s patron saint. Despite having been mentioned as early as 1118 as belonging to the Camaldolese monastery on the island of Montecristo, there is no precise information regarding its construction.
The church stands on a burial site dating to the Byzantine era; it presents a single hall with apse and wooden ceiling. Externally, the dark trachyte ashlar elevations are enclosed by angular pilasters and articulated by smooth half-pilasters, while at the top, a continuous line of round suspended arches runs along on brackets. Narrow monophors open out on each side transom and are again present in the semicircular apse.
The gabled facade features three narrow half-pilaster transoms and is rounded off at the top with a bell gable with double arches. The quadrangular portal with rounded arch lunette opens out in the central transom, configured on protoanthropomorphics.
The interior preserves the wooden sculpture of its saint and the sixteenth-century mausoleum of the Marquis Emanuele of Castelvì; it was produced in marble and trachyte and is a statue of the deceased kneeling on the trachyte sarcophagus, held up by two white marble lions.
