Borne milliaire

After the Roman conquest of Gaul, the Suran valley benefited from the proximity of Lyon, from where the trade routes and legions to Germania left. The route of this road roughly follows the RD 42.
The Roman settlers founded large and prosperous estates here.

These roads were punctuated by milestones (distance between each milestone 1 Roman mile). The last one in the valley is at Lassera (Germagnat)