ii ▁and ▁Ra ura ci ▁most ▁likely ▁lost ▁their ▁status ▁as ▁fo eder ati ▁only ▁six ▁years ▁after ▁the ▁battle ▁of ▁Bib ract e , ▁when ▁they ▁supported ▁Ver cing et or ix ▁in ▁ 5 2 ▁BC ▁with ▁ 8 , 0 0 0 ▁and ▁ 2 , 0 0 0 ▁men , ▁respectively . ▁S omet ime ▁between ▁ 5 0 ▁and ▁ 4 5 ▁BC , ▁the ▁Rom ans ▁founded ▁the ▁Col onia ▁I ul ia ▁E quest ris ▁at ▁the ▁site ▁of ▁the ▁Hel vet ian ▁settlement ▁Nov iod un um ▁( mod ern ▁Ny on ), ▁and ▁around ▁ 4 4 ▁BC ▁the ▁Col onia ▁R aur ica ▁on ▁R aur ac an ▁territory . ▁These ▁colon ies ▁were ▁probably ▁established ▁as ▁a ▁means ▁of ▁cont rolling ▁the ▁two ▁most ▁important ▁military ▁access ▁routes ▁between ▁the ▁Hel vet ian ▁territory ▁and ▁the ▁rest ▁of ▁Ga ul , ▁blocking ▁the ▁passage ▁through ▁the ▁Rh ône ▁valley ▁and ▁Sund g au . ▁ ▁In ▁the ▁course ▁of ▁August us ' ▁reign , ▁Roman ▁domin ance ▁became ▁more ▁concrete . ▁Some ▁of ▁the ▁traditional ▁C elt ic ▁opp ida ▁were ▁now ▁used ▁as ▁leg ion ary ▁g arr isons , ▁such ▁as ▁V ind on issa ▁or ▁Bas ile a ▁( mod ern ▁Bas el ); ▁others ▁were ▁re located , ▁such ▁as ▁the ▁hill - fort ▁on ▁the ▁Bo is ▁de ▁Ch ât el , ▁whose ▁inhabitants ▁founded ▁the ▁new ▁“ cap ital ” ▁of ▁the ▁civ itas ▁at ▁nearby