Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
The Carnutes - The Arverni
Conspirators from all the cantons of central Gaul assembled; the Carnutes, as most directly affected by the execution of Acco, offered to take the lead. On a set day in the winter of 701-702 the Carnutic knights Gutruatus and Conconnetodumnus gave at Cenabum (Orleans) the signal for the rising, and put to death in a body the Romans who happened to be there. The most vehement agitation seized the length and breadth of the great Celtic land; the patriots everywhere bestirred themselves.
But nothing stirred the nation so deeply as the insurrection of the Arverni. The government of this community, which had formerly under its kings been the first in southern Gaul, and had still after the fall of its principality occasioned by the unfortunate wars against Rome(45) continued to be one of the wealthiest, most civilized, and most powerful in all Gaul, had hitherto inviolably adhered to Rome.
45. Cf. IV. V. War with the Allobroges and Arverni
Even now the patriot party in the governing common council was in the minority; an attempt to induce it to join the insurrection was in vain. The attacks of the patriots were therefore directed against the common council and the existing constitution itself; and the more so, that the change of constitution which among the Arverni had substituted the common council for the prince(46) had taken place after the victories of the Romans and probably under their influence.
46. Cf. V. VII. Cantonal Constitution
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=109