Rhaetia

Rhaetia, ancient name of the district, and later of a Roman province, that embraces most of the Alpine tract between the basins of the Po and the Danube rivers. It was bounded to the north by Vindelicia, to the east by Noricum, to the south by Cisalpine Gaul, and to the west by the territory of the Helvetii. The natives, a hardy and warlike people, were finally conquered by the Romans about 15 bc. Rhaetia then became a Roman province, and late in the 1st century ad Vindelicia was united with it. The chief town of Rhaetia was Tridentum, now Trento, Italy, and that of Vindelicia was Augusta Vindelicorum, now Augsburg, Germany.