The country of the Aedui is defined by reports of them in ancient writings. The upper Loire formed their western border, separating them from the Bituriges. The Saône formed their eastern border, separating them from the Sequani. The Sequani did not reside in the region of the confluence of the Doubs into the Saône and of the latter into the Rhône, as Caesar says that the Helvetii, following the pass between the Jura Mountains and the Rhône southwards, 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 Saône and the Doubs, and in the next, that the Sequani lived across the Saône (eastward). Both statements are true, the first in the south, and the second to the north.
Outside of the Roman province and prior to Roman rule, Independent 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 (the Arverni, the Sequani, and the Helvetii), had replaced their monarchy with a council of magistrates called grand-judges. The grand-judges were under the authority of the senate. The senate was made up of the descendants of ancient royal families. Free men in the tribes were vassals to the heads of these families in exchange for military, financial and political interests.
When the Sequani, their hereditary rivals, with the assistance of a Germanic chieftain named Ariovistus, defeated and massacred the Aedui at the Battle of Magetobriga, the Aedui sent Diviciacus, the druid, to Rome to appeal to the senate for help, but his mission was unsuccessful.