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 Latin League
All these cantons were in primitive times politically sovereign, and each of them was governed by its prince with the co-operation of the council of elders and the assembly of warriors. Nevertheless the feeling of fellowship based on community of descent and of language not only pervaded the whole of them, but manifested itself in an important religious and political institution--the perpetual league of the collective Latin cantons. The presidency belonged originally, according to the universal Italian as well as Greek usage, to that canton within whose bounds lay the meeting-place of the league; in this case it was the canton of Alba, which, as we have said, was generally regarded as the oldest and most eminent of the Latin cantons. The communities entitled to participate in the league were in the beginning thirty--a number which we find occurring with singular frequency as the sum of the constituent parts of a commonwealth in Greece and Italy.
What cantons originally made up the number of the thirty old Latin communities or, as with reference to the metropolitan rights of Alba they are also called, the thirty Alban colonies, tradition has not recorded, and we can no longer ascertain. The rendezvous of this union was, like the Pamboeotia and the Panionia among the similar confederacies of the Greeks, the "Latin festival" (-feriae Latinae-), at which, on the "Mount of Alba" (-Mons Albanus-, -Monte Cavo-), upon a day annually appointed by the chief magistrate for the purpose, an ox was offered in sacrifice by the assembled Latin stock to the "Latin god" (-Jupiter Latiaris-). Each community taking part in the ceremony had to contribute to the sacrificial feast its fixed proportion of cattle, milk, and cheese, and to receive in return a portion of the roasted victim. These usages continued down to a late period, and are well known: respecting the more important legal bearings of this association we can do little else than institute conjectures.
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Reference address : https://www.ellopos.net/elpenor/rome/1-03-settlements-latins.asp?pg=11