Arar formed their eastern border, separating them from the Sequani. The Sequani did not reside in the region of the confluence of the Dubis and the Arar, and of the Arar into the Rhodanus, as Caesar says that the Helvetii, traveling southward along the pass between the Jura Mountains and the Rhodanus, which belonged to the Sequani, plundered the territory of the Aedui. These circumstances explain an apparent contradiction in Strabo, who in one sentence says that the Aedui lived between the Arar and the Dubis, and in the next, that the Sequani lived across the Arar (eastward). History Pre-Roman period By the early 3rd century BC, the emergence of groups of settlements with diversified functions, along with the creation of sanctuaries, suggest the beginning of a continuous La Tène settlement in the region. Roman period Outside of the Roman province and prior to Roman rule, Gaul was occupied by self-governing tribes divided into cantons, and each canton was further divided into communes. The Aedui, like other powerful tribes in the region, such as the Arverni, Sequani, and Helvetii, had replaced their monarchy with a council of magistrates called grand-judges. The grand-judges were under the authority of a senate. This senate was made up of the descendants of ancient royal families. Free men in the tribes were vassals of the heads of these families, in an exchange of military, financial, and political interests. According to Livy (v. 34), the Aedui took part in the expedition of Bellovesus into Italy in the sixth century BC. Before Caesar's time, they had attached themselves to the Romans and were honoured with the title of brothers and kinsmen of the Roman people. When the Sequani, their traditional rivals, defeated and massacred the Aedui at the Battle of Magetobriga in 63 BC, with the assistance of the Germanic chieftain Ariovistus, the Aedui sent the druid Diviciacus to Rome with an appeal to the senate for help; but his mission was unsuccessful. After his arrival in Gaul in 58 BC, Caesar restored the independence of the Aedui. In spite of this, they subsequently joined the Gallic coalition against Caesar (B. G. vii. 42), but after the surrender of Vercingetorix at the Battle of Alesia, the Aedui gladly returned to their allegiance. Augustus dismantled their capital, Bibracte, on Mont Beuvray, and constructed a new town with a half-Roman, half-Gaulish name, Augustodunum (modern Autun). In AD 21, during