Gallia Narbonensis
Lucus was incorporated into the Roman province of Gallia Narbonensis, and is placed by the Antonine Itinerary on a road from Vapincum (modern Gap) to Lugdunum (modern Lyon): it is the first stage after Mons Seleucus, and lies between Mons Seleucus and Dea Vocontiorum (modern Die).