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 striking affinity of certain dialectic peculiarities of Sicilian Greek with the Latin is probably to be explained rather by the old commercial connections subsisting between Rome and the Sicilian Greeks, than by the ancient identity of the languages of the Siculi and the Romans. According to all indications, however, not only Latium, but probably also the Campanian and Lucanian districts, the Italia proper between the gulfs of Tarentum and Laus, and the eastern half of Sicily were in primitive times inhabited by different branches of the Latin nation.
Destinies very dissimilar awaited these different branches. Those settled in Sicily, Magna Graecia, and Campania came into contact with the Greeks at a period when they were unable to offer resistance to their civilization, and were either completely Hellenized, as in the case of Sicily, or at any rate so weakened that they succumbed without marked resistance to the fresh energy of the Sabine tribes. In this way the Siculi, the Itali and Morgetes, and the Ausonians never came to play an active part in the history of the peninsula. It was otherwise with Latium, where no Greek colonies were founded, and the inhabitants after hard struggles were successful in maintaining their ground against the Sabines as well as against their northern neighbours. Let us cast a glance at this district, which was destined more than any other to influence the fortunes of the ancient world.
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Reference address : https://www.ellopos.net/elpenor/rome/1-03-settlements-latins.asp?pg=3