The church is octagonal and is dedicated to St. Rocco probably in memory of the plague. San Rocco was born in France in 1295 and died August 16, 1327 and is the patron saint and destroyer of the plague. San Sebastian, however, is a martyr who, as San Vito, died during the persecutions of the Roman Emperor Diocletian.
The central medallion of the octagonal ceiling is dedicated to Saint Sebastian and the eight segments are represented around eight Carmelite saints. Over and above the main altar, the image of the Eternal Father looks at the audience of the faithful. On either side of the altar there are heraldic elements that represent the ancient ownership by Theodoli and the presence of the Carmelites.