 Drusus arrived in Gaul in late 15 BC to serve as "legatus Augusti pro praetore" (governor on Augustus' behalf with the authority of a praetor) of the three Gaulish provinces.His contribution to the ongoing building and urban development in Gaul can be seen in the establishment of the "pes Drusianus", or ‘Drusian foot’, of about , which was in use in Samarobriva (modern Amiens) and among the Tungri.From 14 to 13 BC, Augustus himself was also active in Gaul, whether in Lugdunum (modern Lyon) or along the Rhine frontier.