In 166 AD the Quadi and Marcomanni invaded Venetia. It was the beginning of many barbarian invasions. Marcus Aurelius retaining the regions of Italia, superimposed another layer of administration by ascribing Regions X and XI to the district of Transpadana under a iuridicus. The end of the 3rd c. brought further administrative changes when Diocletian abolished the regions and districts and established provinciae. Thus, Region X (Venetia et Histria) became Province VIII (Venetia et Histria), being enlarged in the west up to the Adda River governed by a corrector until 363 and from 368 to 373 by a consularius seated at Aquileia. Venetia et Histria remained one of the 16 Provinces of Italy in the 5th century when both Alaric the Goth and then Attila and the Huns devastated the area. Attila laid siege to Aquileia and turned it into a ruin in 452 AD. Many of the mainland inhabitants sought protection in the nearby lagoons which would become Grado in the east and Venice more to the west. On the heels of the Huns came the Ostrogoths who not only invaded, but also settled down in the region, especially near Treviso where the penultimate king Totila was born.