The province had its origin in a local chiefdom controlled by the enfranchised kingMarcus Julius Donnus, who ruled overLigurian tribes of the region by the middle of the 1st century BC. He was succeeded by his son,Marcus Julius Cottius, who offered no opposition to the integration of his realm into the Roman imperial system under EmperorAugustus in 15–14 BC, then kept on ruling on native tribes as apraefectus civitatium of aRegnum Cotti.[3][1][2]
After the death of his sonCottius II in 63 AD, the region was annexed by EmperorNero and made into a procuratorial province known asprovincia Alpium Cottiarum.[4][1][2]