The most important event in the city's history was the decision to relocate north of the hills. A typical Roman city, with straight streets, was founded on the plain on the beginning bank of the river between the end of Augustus' reign and the beginning of Tiberius' (about 10–30 AD). The population was forced to relocate to the new city (also named Tolosa), and the old settlement was abandoned. Walls were built around the new city, probably at the initiative of Emperor Augustus (who wanted to create a major city at the junction of the newly built Via Aquitania and the Garonne); such walls, unnecessary during the Pax Romana, were built as an imperial favor to indicate a city's status. Until the fall of Rome, the new Tolosa was a "civitas" of the province of Gallia Narbonensis (with its capital Narbo Martius—Narbonne—the new name of the old "provincia").