Via Domitia

The Via Domitia was the first Roman road built in Gaul, to link Italy and Hispania through Gallia Narbonensis, across what is now Southern France. The route that the Romans regularised and paved was ancient when they set out to survey it, and traces the mythic route travelled by Heracles.

The construction of the road was commissioned by Gnaeus Domitius Ahenobarbus, whose name it bore, following the defeat of the Allobroges and Averni by himself and Quintus Fabius Maximus Allobrogicus in 122 BCE. Domitius also established a fortified garrison at Narbo on the coast, near Hispania, to guard construction of the road. It soon developed into a full Roman colony Colonia Narbo Martius. The lands on the western part of the route, beyond the River Rhône had been under the control of the Averni who, according to Strabo, had stretched their control to Narbo and the Pyrenees.

Source: Wikipedia