 Complete the following phrase:  The city was crucial during the early stages of the barbarian invasions which stormed Italy during the fall of the Western Roman Empire. In early 402 AD the Visigoths had invaded northern Italy and were advancing on Mediolanum modern Milan which was the imperial capital at that time. Honorius, the young emperor and a resident in that city, unable to wait for promised reinforcements any longer, was compelled to flee from Milan for safety in the city of Arles in Gaul. However, just after his convoy had left Milan and crossed the River Po his escape route through the Alps was cut off by the Gothic cavalry. This forced him to take emergency refuge in the city of Hasta until more Roman troops could be assembled in Italy. The Goths placed Hasta under siege until March when General Stilicho, bringing reinforcements from the Rhine, fought and defeated them at the 