The town was redesigned from AD 50 onwards. The buildings were now constructed in stone. The neighbouring regions on the right side of the River Rhine were also gradually incorporated into the Roman Empire. The border was moved northwards, away from the Rhine, where it was protected by the Upper German-Raetian limes, a fortified frontier stretching from Mainz to Regensburg in Germany. Augusta Raurica was now located in the quiet hinterland. The military camp was replaced by further residential and commercial quarters – Augusta Raurica evolved into a thriving centre of trade and commerce.