Ravenna is one of the great cultural sites in Europe. The city's monuments bear witness to the succession of three major civilizations. In the 5th century, Ravenna was the last capital of the Roman Empire. The city then served as the seat of Theodoric I's short-lived barbarian kingdom. After its collapse, Ravenna became a major hub in the Byzantine Empire. The city is thus renowned and revered for churches and mausoleums decorated with superb mosaics spanning all three civilizations. Often Roman, Arian, and Byzantine art adorns the same building.