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 Province of Narbo
While Cisalpine Gaul was thus substantially merged in Italy, the place which it had hitherto occupied was taken by the Transalpine province, which had been converted by the conquests of Caesar from a frontier into an inland province, and which by its vicinity as well as by its climate was fitted beyond all other regions to become in due course of time likewise an Italian land. Thither principally, according to the old aim of the transmarine settlements of the Roman democracy, was the stream of Italian emigration directed.
There the ancient colony of Narbo was reinforced by new settlers, and four new burgess-colonies were instituted at Baeterrae (Beziers) not far from Narbo, at Arelate (Aries) and Arausio (Orange) on the Rhone, and at the new seaport Forum Julii (Frejus); while the names assigned to them at the same time preserved the memory of the brave legions which had annexed northern Gaul to the empire.(91)
91. Narbo was called the colony of the Decimani, Baeterrae of the Septimani, Forum Julii of the Octavani, Arelate of the Sextani, Arausio of the Secundani. The ninth legion is wanting, because it had disgraced its number by the mutiny of Placentia (p. 246). That the colonists of these colonies belonged to the legions from which they took their names, is not stated and is not credible; the veterans themselves were, at least the great majority of them, settled in Italy (p. 358). Cicero's complaint, that Caesar "had confiscated whole provinces and districts at a blow" (De Off. ii. 7, 27; comp. Philipp. xiii. 15, 31, 32) relates beyond doubt, as its close connection with the censure of the triumph over the Massiliots proves, to the confiscations of land made on account of these colonies in the Narbonese province and primarily to the losses of territory imposed on Massilia.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=155