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
It is true that they could not prevent a similar foundation by the democratic party from succeeding at another point: in the course of the conquests beyond the Alps which Marcus Flaccus had begun, the colony of Narbo (Narbonne) was founded there in 636, the oldest transmarine burgess- city in the Roman empire, which, in spite of manifold attacks by the government party and in spite of a proposal directly made by the senate to abolish it, permanently held its ground, protected, as it probably was, by the mercantile interests that were concerned. But, apart from this exception--in its isolation not very important--the government was uniformly successful in preventing the assignation of land out of Italy.
The Italian domain-question was settled in a similar spirit. The Italian colonies of Gaius, especially Capua, were cancelled, and such of them as had already been planted were again broken up; only the unimportant one of Tarentum was allowed to subsist in the form of the new town Neptunia placed alongside of the former Greek community. So much of the domains as had already been distributed by non-colonial assignation remained in the hands of the recipients; the restrictions imposed on them by Gracchus in the interest of the commonwealth--the ground-rent and the prohibition of alienation--had already been abolished by Marcus Drusus.
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Reference address : https://www.ellopos.net/elpenor/rome/4-04-rule-restoration.asp?pg=6