The  Hallstatt and La Tène cultures flourished during the late Iron Age, from around 450 BC—possibly under some influence of both the  Greek and Etruscan civilisations. One of the most important tribal groups in the Alpine region were the Helvetii. In 58 BC, at the Battle of Bibracte, Julius Caesar defeated the Alpine tribes, thereby bringing the region under close control of the Roman Republic. By 15 BC, Tiberius – later the second Roman emperor – with his brother,  Drusus, conquered the entirety of the Alpine area. Liechtenstein then became integrated into the Roman province of Raetia. The area was maintained by the  Roman army, which maintained large legionary camps at  Brigantium (Austria), near Lake Constance, and at Magia (Swiss). The Romans built and maintained a  road which ran through the territory. Circa AD 260 Brigantium was destroyed by the Alemanni, a Germanic people who settled in the area in around AD 450.