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
Their privileged position there rendered the Roman language and the Roman law privileged also, even where Romans were not merely transacting business with each other.(2)
2. Cf. IV. X. The Roman Municipal System
Everywhere the Italians kept together as compact and organized masses, the soldiers in their legions, the merchants of every larger town as special corporations, the Roman burgesses domiciled or sojourning in the particular provincial court-district as "circuits" (-conventus civium Romanorum-) with their own list of jurymen and in some measure with a communal constitution; and, though these provincial Romans ordinarily returned sooner or later to Italy, they nevertheless gradually laid the foundations of a fixed population in the provinces, partly Roman, partly mixed, attaching itself to the Roman settlers.
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Reference address : https://www.ellopos.net/elpenor/rome/4-12-nationality-religion-education.asp?pg=3