The rich exterior decoration contains multicolored marble, mosaic, and numerous bronze objects from the spoils of war, among which is the griffin which was taken in Palermo in 1061 and later placed on the eastern part of the roof. In the early 19th century the original sculpture, which can now be seen in the cathedral museum, was removed from the roof and replaced with a copy. The high arches show Islamic and southern Italian influence. The blind arches with lozenge shapes recall similar structures in Armenia. The facade of grey and white marble, decorated with colored marble inserts, was built by Master Rainaldo. Above the three doorways are four levels of loggia divided by cornices with marble intarsia, behind which open single, double, and triple windows.