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
Intervention of the Tarentines
The most natural allies of the Samnites would have been the Tarentines; but it was part of that fatality that hung over Samnium and over Italy in general, that at this moment so fraught with the destinies of the future the decision lay in the hands of these Athenians of Italy. Since the constitution of Tarentum, which was originally after the old Doric fashion strictly aristocratic, had become changed to a complete democracy, a life of singular activity had sprung up in that city, which was inhabited chiefly by mariners, fishermen, and artisans.
The sentiments and conduct of the population, more wealthy than noble, discarded all earnestness amidst the giddy bustle and witty brilliance of their daily life, and oscillated between the grandest boldness of enterprise and elevation of spirit on the one hand, and a shameful frivolity and childish whim on the other.
It may not be out of place, in connection with a crisis wherein the existence or destruction of nations of noble gifts and ancient renown was at stake, to mention that Plato, who came to Tarentum some sixty years before this time, according to his own statement saw the whole city drunk at the Dionysia, and that the burlesque farce, or "merry tragedy" as it was called, was created in Tarentum about the very time of the great Samnite war.
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Reference address : https://www.ellopos.net/elpenor/rome/2-06-italians-rome.asp?pg=18