Tiberius, who is destined to be the second Roman emperor, and his brother, Drusus, conquer the Alps in 15 BCE, integrating them into the Roman Empire.

The area occupied by the Helvetii—the namesakes of the later Confoederatio Helvetica—first becomes part of Rome's Gallia Belgica province, then of its Germania Superior province, while the eastern portion of modern Switzerland is integrated into the Roman province of Raetia.

Sometime around the start of the Common Era, the Romans maintain a large legionary camp called Vindonissa, now a ruin at the confluence of the Aare and Reuss rivers, near the town of Windisch, an outskirt of Brugg.