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
Among the subject communities the most privileged and most important class was that of the Latin towns, which obtained accessions equally numerous and important in the autonomous communities founded by Rome within and even beyond Italy--the Latin colonies, as they were called --and was always increasing in consequence of new settlements of the same nature. These new urban communities of Roman origin, but with Latin rights, became more and more the real buttresses of the Roman rule over Italy.
These Latins, however, were by no means those with whom the battles of the lake Regillus and Trifanum had been fought. They were not those old members of the Alban league, who reckoned themselves originally equal to, if not better than, the community of Rome, and who felt the dominion of Rome to be an oppressive yoke, as the fearfully rigorous measures of security taken against Praeneste at the beginning of the war with Pyrrhus, and the collisions that evidently long continued to occur with the Praenestines in particular, show.
This old Latium had essentially either perished or become merged in Rome, and it now numbered but few communities politically self-subsisting, and these, with the exception of Tibur and Praeneste, throughout insignificant.
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Reference address : http://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=71