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
This maxim of law was now extended to the whole territory of the league; no member of any of the federal states might live as a slave within the bounds of the league. Applications of this principle are seen in the enactment embodied in the Twelve Tables, that the insolvent debtor, in the event of his creditor wishing to sell him, must be sold beyond the boundary of the Tiber, in other words, beyond the territory of the league; and in the clause of the second treaty between Rome and Carthage, that an ally of Rome who might be taken prisoner by the Carthaginians should be free so soon as he entered a Roman seaport. Although there did not probably subsist a general intercommunion of marriage within the league, yet, as has been already remarked(8) intermarriage between the different communities frequently occurred.
8. Cf. I. III. The Latin League
Each Latin could primarily exercise political rights only where he was enrolled as a burgess; but on the other hand it was implied in an equality of private rights, that any Latin could take up his abode in any place within the Latin bounds; or, to use the phraseology of the present day, there existed, side by side with the special burgess-rights of the individual communities, a general right of settlement co-extensive with the confederacy; and, after the plebeian was acknowledged in Rome as a burgess, this right became converted as regards Rome into full freedom of settlement. It is easy to understand how this should have turned materially to the advantage of the capital, which alone in Latium offered the means of urban intercourse, urban acquisition, and urban enjoyments; and how the number of --metoeci-- in Rome should have increased with remarkable rapidity, after the Latin land came to live in perpetual peace with Rome.
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Reference address : https://www.ellopos.net/elpenor/rome/1-07-hegemony-rome-latium.asp?pg=10