While the interior features lavish and ostentatious frescoes, typical of the Baroque era, set alongside the golden splendour of Byzantine mosaics, the exterior is characterised by a delightful mix of styles: representative elements typical of Norman and Islamic-derived architecture, such as the articulation of the elevations with recessed, ogival-arched niches, which give a vibrant rhythm to the masonry. There is also an original frieze, with an inscription in Greek, commemorating the founder, George of Antioch.