wool dress, a scarf and a pendant made of glass and amber beads were also discovered with the woman. Roman era In 58 BCE, the Helvetii tried to evade migratory pressure from Germanic tribes by moving into Gaul, but were stopped and defeated at Bibracte (near modern-day Autun) by Julius Caesar's armies and then sent back. In 15 BCE, Tiberius and Drusus conquered the Alps, and the region became integrated into the Roman Empire: the Helvetii settlement area became part first of Gallia Belgica and later of the province of Germania Superior, while the eastern part was integrated into the Roman province of Raetia. The following 300 years saw extensive Roman settlement, including the construction of a road network and the founding of many settlements and cities. The center of Roman occupation was at Aventicum (Avenches), other cities were founded at Arbor Felix (Arbon), Augusta Raurica (Kaiseraugst near Basel), Basilea (Basel), Curia (Chur), Genava (Genève), Lousanna (Lausanne), Octodurum (Martigny, controlling the pass of the Great St. Bernard), Salodurum (Solothurn), Turicum (Zürich) and other places. Military garrisons existed at Tenedo (Zurzach) and Vindonissa (Windisch). The Romans also developed the Great St. Bernard Pass beginning in the year 47, and in 69 part of the legions of Vitellius used it to traverse the Alps. The passes were expanded from dirt trails to narrow paved roads. Between 101 and 260, the legions moved out of the region, allowing trade to expand. In Raetia, Roman culture and language became dominant. Nearly 2,000 years later, some of the population of Graubünden still speak Romansh which is descended from Vulgar Latin. In 259, Alamanni tribes overran the Limes and caused widespread devastation of Roman cities and settlements. The Roman empire managed to reestablish the Rhine as the border, and the cities on Swiss territory were rebuilt. However, it was now a frontier province, and consequently the new Roman cities were smaller and much more fortified. Christianization and post-Roman era In the late Roman period in the 3rd and 4th centuries, the Christianization of the region began. Legends of Christian martyrs such as Felix and Regula in Zürich probably are based on events that occurred during the persecution of Christians under Diocletian around 298. The story of the Theban Legion, which was martyred near Saint Maurice-en-Valais in Valais, figures into the histories of many towns in Switzerland. The first bishoprics were founded in the 4th and 5th