Strabo Geography 4.2.3

[3] The Arverni are situated along the Loire. Nemossus, their metropolis, is built on the same river. ¹ This river having flowed past Genabum, ² an emporium of the Carnutes, ³ situated about the middle of its course, discharges itself into the ocean. A great proof of the former power of the Arverni, is the fact of the frequent wars which they sustained against the Romans, sometimes with armies of 200,000 men, and sometimes with double that number, which was the amount of their force when they fought against divus Caesar under the command of Vercingetorix. ⁴ Before this they had brought 200,000 men against Maximus Aemilianus, and the same number against Domitius Aenobarbus. Their battles with Caesar took place, one in Gergovia, ⁵ a city of the Arverni situated on a lofty mountain, the birth-place of Vercingetorix; the other, near to Alesia, ⁶ a city of the Mandubii, who border on the Arverni; this city is likewise situated on a high hill, surrounded by mountains, and between two rivers. Here the war was terminated by the capture of their leader. The battle with Maximus Aemilianus was fought near the confluence of the Isère and the Rhone, at the point where the mountains of the Cevennes approach the latter river. That with Domitius was fought lower down at the confluence of the Sulgas ⁷ and the Rhone. The Arverni extended their dominion as far as Narbonne and the borders of Marseilles, and exercised authority over the nations as far as the Pyrenees, the ocean, and the Rhine. Luerius, ⁸ the father of Bituitus who fought against Maximus and Domitius, is said to have been so distinguished by his riches and luxury, that to give a proof of his opulence to his friends, he caused himself to be dragged across a plain in a car, whilst he scattered gold and silver coin in every direction for those who followed him to gather up.