of so-called "Austria Romana" (as it became known in the 19th century). Noricum became a province of the Roman Empire. During the reign of the Emperor Claudius (41–54 AD), the Roman province of Noricum had as its boundaries to the north the Danube, to the north-east the Vienna Woods, and in the east approximately the current eastern border of Styria, while in the south-east and south it was bounded by the Eisack and Drava rivers. Later, under Diocletian (284–305), the province was divided along the main Alpine ridge into a northern (Noricum ripense) and a southern (Noricum Mediterraneum). Across the Ziller in the west, corresponding to the present provinces of Vorarlberg and Tyrol, lay the province of Raetia, incorporating the earlier territory of Vindelicia. In the east lay Pannonia, including what is today the Burgenland. To the south was Region 10, Venetia et Histria. The Danube river formed the Danubian limes (limes Danubii), a defensive line separating Upper and Lower Austria from the Germanic tribes of the Marcomanni and Quadi. The Romans built many cities that survive today. They include Vindobona (Vienna), Juvavum (Salzburg), Valdidena (Innsbruck), and Brigantium (Bregenz). Other important towns were Virunum (north of the modern Klagenfurt), Teurnia (near Spittal), and Lauriacum (Enns). Significant archaeological sites from the Roman period include Kleinklein (Styria) and Zollfeld (Magdalensberg). Christianity appeared in Austria in the 2nd century AD, prompting Church organization that can be traced back to the 4th century AD. After the arrival of the Bavarii, Austria became the object of missionary efforts, such as Rupert and Virgil of the Hiberno-Scottish mission. Migration period First phase: Goths, 300–500 AD The Great Migration (Völkerwanderung) sealed the decline of Roman power in Austria. In the First Phase (300–500 AD) the Roman Empire was increasingly harassed by Germanic tribes from the 5th Century, including Goths and Vandals. As the fabric of the Roman Empire crumbled, the ability of Raetia, Noricum, and Pannonia to defend themselves became increasingly problematic. Radagaisus overran part of the country in 405. (Géza Alföldy pp. 213–4). After several raids on Italy, the Visigoths arrived in 408, under Alaric I. As described by Zosimus, Alaric set out from Emona (modern Ljubljana) which lay between Pannonia Superior and Noricum over the Carnic Alps arriving at Virunum in Noricum, as had been agreed to by the Roman general Stilicho, following several skirmishes between the two. Alaric was voted a large amount of