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
Progress of Hellenism in Italy-- Adoption of Greek Habits at the Table
These nationalities were at the same time assailed from another quarter and by an ascendency resting on another basis--by Hellenism. This was the period when Hellenism began to become conscious of its intellectual superiority to the other nations, and to diffuse itself on every side. Italy did not remain unaffected by it. The most remarkable phenomenon of this sort is presented by Apulia, which after the fifth century of Rome gradually laid aside its barbarian dialect and silently became Hellenized.
This change was brought about, as in Macedonia and Epirus, not by colonization, but by civilization, which seems to have gone hand in hand with the land commerce of Tarentum; at least that hypothesis is favoured by the facts, that the districts of the Poediculi and Daunii who were on friendly terms with the Tarentines carried out their Hellenization more completely than the Sallentines who lived nearer to Tarentum but were constantly at feud with it, and that the towns that were soonest Graecized, such as Arpi, were not situated on the coast.
The stronger influence exerted by Hellenism over Apulia than over any other Italian region is explained partly by its position, partly by the slight development of any national culture of its own, and partly also perhaps by its nationality presenting a character less alien to the Greek stock than that of the rest of Italy.(45)
45. Cf. I. II. Iapygians
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Reference address : https://www.ellopos.net/elpenor/rome/2-08-law-religion-army-economy-nationality.asp?pg=45