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
While the Celtic and Ligurian population of these regions was thus in the course of losing its nationality, and was languishing and pining withal under a political and economic oppression, the intolerable nature of which is sufficiently attested by their hopeless insurrections, the decline of the native population here went hand in hand with the naturalizing of the same higher culture which we find at this period in Italy.
Aquae Sextiae and still more Narbo were considerable townships, which might probably be named by the side of Beneventum and Capua; and Massilia, the best organized, most free, most capable of self-defence, and most powerful of all the Greek cities dependent on Rome, under its rigorous aristocratic government to which the Roman conservatives probably pointed as the model of a good urban constitution, in possession of an important territory which had been considerably enlarged by the Romans and of an extensive trade, stood by the side of those Latin towns as Rhegium and Neapolis stood in Italy by the side of Beneventum and Capua.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=12