Short answers, pulled from the story.
Gallia Narbonensis was a Roman province located in what is now Occitania and Provence in southern France. It was bordered by the Pyrenees to the west, the Cévennes to the north, the Alps to the east, and the Gulf of Lion to the south, and it took in most of the Rhône river's drainage basin.
Gallia Narbonensis became a Roman province in 121 BC. This followed the First Transalpine War of 125-121 BC, in which the Roman general Quintus Fabius Maximus defeated the Allobroges and the Arverni under king Bituitus at the Battle of the Isère River.
Gallia Narbonensis was called Provincia Nostra, meaning Our Province, because it was the first Roman province established north of the Alps. Romans also referred to it simply as Provincia, the Province, a term that survives today in the French name Provence.
Julius Caesar launched his Gallic Wars from Narbo, the provincial capital of Gallia Narbonensis, and used the province as a base to rebuild the city and found Fréjus and Arles. He also granted Roman citizenship to many communities across the province.
The Visigothic Kingdom absorbed Gallia Narbonensis and its surrounding territory between 462 and 477 AD, permanently ending Roman political control there. Earlier, in 314 AD, Emperor Diocletian had already merged the province with Gallia Aquitania into a new administrative unit called Dioecesis Viennensis.
The known governors of Gallia Narbonensis form a list with gaps and damaged records, starting with Gnaeus Pullius Pollio, who governed from 18 to 16 BC. One governor, recorded only as unknown, was allegedly killed in 210 AD for supporting Geta.