The church ends with a polygonal apse, sided by two chapels with apses. The plan has a main apse flanked by two subsidiary apses. Excavations revealed that this Carolingian cathedral had three naves and three apses. These churches had three naves and three apses. The church consists of a single nave with three apses. The structure has 5 naves, 5 apses, and (quite surprisingly for Byzantine architecture) 13 cupolas. Located on the second floor is a church with a nave and two apses. His palace contained three domes resting over walls with alternating apses and rectangular openings. The churches have usually basilica or centralized plans, sometimes with opposing apses. The early churches were mostly simple basilicas, but some with side apses. The tower is octagonal with a central space of five apses. Dormition Cathedral is a tremendous six-pillared building with five apses and five domes. The north and south apses have no altars. It is a basilica with three apses, built in the characteristic white local limestone. The vaults of the apses and ambulatory display well preserved examples of Late Roman mosaics.