Sparkling and precious, the entire mosaic mantle of the interior was created by Byzantine craftsmen and local artists over a rather long period of time, between about 1177 and 1183. It follows a precise theological-dogmatic logic, starting from the mosaics of the main aisle, in which scenes from the Creation to the Jacob cycle from the Old Testament stand out, to the episodes of the Life of Christ, visible in the side aisles and described in the New Testament. In this initial path, in which visitors are filled with an arcane and inexpressible feeling, one’s attention naturally focuses on the grandiose image of Christ Pantocrator in the apse, in eloquent harmony with the architecture as a whole.
