The Romans, by protecting the people of Marseilles, had extended their dominion on the coast; by contracting other alliances, they penetrated into the interior. The Ædui were at war with the Allobroges and the Arverni. The proconsul Cn. Domitius Ahenobarbus united with the former, and defeated the Allobroges, in 633, at Vindalium, on the Sorgue (_Sulgas_), not far from the Rhone. Subsequently, Q. Fabius Maximus, grandson of Paulus Æmilius, gained, at the confluence of the Isère and the Rhone, a decisive victory over the Allobroges, and over Bituitus, king of the Arverni. By this success Q. Fabius gained the surname of _Allobrogicus_.[11] The Arverni pretended to be descendants of the Trojans, and boasted a common origin with the Romans;[12] they remained independent, but their dominion, which extended from the banks of the Rhine to the neighbourhood of Narbonne and Marseilles, was limited to their ancient territory. The Ruteni, who had been their allies against Fabius, obtained similarly the condition of not being subjected to the Roman power, and were exempted from all tribute.[13] In 636, the Consul Q. Marcius Rex founded the colony of Narbo Marcius, which gave its name to the Roman province called _Narbonensis_.[14] The movement which had long thrust the peoples of the north towards the south had slackened during several centuries, but in the seventh century of the foundation of Rome it seems to have re-commenced with greater intensity than ever. The Cimbri and the Teutones,[15] after ravaging Noricum and Illyria, and defeating the army of Papirius Carbo sent to protect Italy (641), had marched across Rhætia, and penetrated by the valley of the Rhine to the country of the Helvetii. They drew with them a part of that people, spread into Gaul, and for several years carried there terror and desolation. The Belgæ alone offered a vigorous resistance. Rome, to protect her province, sent against them, or against the tribes of the Helvetii, their allies, five generals, who were successively vanquished: the Consul M. Junius Silanus, in 645; M. Aurelius Scaurus, in 646; L. Cassius Longinus, in 647;[16] lastly, in the year 649, the proconsul Q. Servilius Cæpio[17] and Cn. Manlius Maximus. The two last each lost his army.[18] The very existence of Rome was threatened. Marius, by the victories gained at Aix over the Teutones (652), and at the Campi Raudii, not far from the Adige, over the Cimbri (653), destroyed the barbarians and saved Italy.