The province originated in a local chiefdom ruled by the enfranchised kingMarcus Julius Donnus, who governed theLigurian tribes of the region by the middle of the 1st century BC. He was succeeded by his son,Marcus Julius Cottius, who offered no resistance to the incorporation of his realm into the Roman imperial system under EmperorAugustus in 15–14 BC, and continued to rule the native tribes aspraefectus civitatium of theRegnum Cotti.[3][1][2]
After the death of his son,Cottius II, in 63 AD, the region was annexed by EmperorNero and reorganised as a procuratorial province under the nameprovincia Alpium Cottiarum.[4][1][2]