43 B.C. Romans settle at Noviodunum (Nyon) and in various other parts of Helvetia.
27 B.C. Helvetia is made part of Belgica, one of the provinces of Gaul, and comes more directly under Roman control.
15 B.C. Rhætia (the Grisons) is subjugated by armies under Drusus and Tiberius Nero and made a Roman province.
A.D. 69 Aulus Cæcina lays waste Helvetia and massacres large numbers of the inhabitants. Claudius Corius, a Helvetian deputy, by his eloquence saves the people from complete destruction. Aventicum (Avenches) becomes a Roman city of importance. Roman civilisation makes much progress in Helvetia, especially in the western portion. Under the Romans military roads and fortresses are built.
From the German Invasions through the Carlovingians
260 Hordes of Alamanni devastate Switzerland. They partially destroy Aventicum.
300 Christianity makes some converts in Switzerland.
305 Alamanni again overrun Switzerland.
406 The Alamanni conquer eastern Switzerland.
409 The Burgundians march toward the Rhine and approach Switzerland.