The Church of San Cataldo, dating back to around 1160, was built at the behest of Maione da Bari, grand chancellor and great admiral of King William I from 1154 to 1160. Designed by Islamic craftsmen in the Western Romanesque style, the exterior has a compact and solid volume with blind recessed arches framing the single-light windows on each side. The roof has an openwork cornice and three small domes on a drum with small windows. Inside, the walls are undecorated but the opus sectile floor emerges, the result of Islamic craftsmen and of Byzantine origin.
