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
Towards the end of the fourth century mention first occurs of the separate confederacy of the Bruttii,(19) who had detached themselves from the Lucanians--not, like the other Sabellian stocks, as a colony, but through a quarrel --and had become mixed up with many foreign elements.
19. The name itself is very ancient; in fact it is the most ancient indigenous name for the inhabitants of the present Calabria (Antiochus, Fr. 5. Mull.). The well-known derivation is doubtless an invention.
The Greeks of Lower Italy tried to resist the pressure of the barbarians; the league of the Achaean cities was reconstructed in 361; and it was determined that, if any of the allied towns should be assailed by the Lucanians, all should furnish contingents, and that the leaders of contingents which failed to appear should suffer the punishment of death. But even the union of Magna Graecia no longer availed; for the ruler of Syracuse, Dionysius the Elder, made common cause with the Italians against his countrymen. While Dionysius wrested from the fleets of Magna Graecia the mastery of the Italian seas, one Greek city after another was occupied or annihilated by the Italians.
In an incredibly short time the circle of flourishing cities was destroyed or laid desolate. Only a few Greek settlements, such as Neapolis, succeeded with difficulty, and more by means of treaties than by force of arms, in preserving at least their existence and their nationality. Tarentum alone remained thoroughly independent and powerful, maintaining its ground in consequence of its more remote position and its preparation for war--the result of its constant conflicts with the Messapians. Even that city, however, had constantly to fight for its existence with the Lucanians, and was compelled to seek for alliances and mercenaries in the mother-country of Greece.
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Reference address : https://www.ellopos.net/elpenor/rome/2-05-subjugation-latins-campanians.asp?pg=24