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
Greek Cities Near Vesuvius
While the most easterly of the Greek settlements in Italy thus rapidly rose into splendour, those which lay furthest to the north, in the neighbourhood of Vesuvius, attained a more moderate prosperity. There the Cumaeans had crossed from the fertile island of Aenaria (Ischia) to the mainland, and had built a second home on a hill close by the sea, from whence they founded the seaport of Dicaearchia (afterwards Puteoli) and, moreover, the "new city" Neapolis.
They lived, like the Chalcidian cities generally in Italy and Sicily, in conformity with the laws which Charondas of Catana (about 100) had established, under a constitution democratic but modified by a high census, which placed the power in the hands of a council of members selected from the wealthiest men--a constitution which proved lasting and kept these cities free, upon the whole, from the tyranny alike of usurpers and of the mob. We know little as to the external relations of these Campanian Greeks.
They remained, whether from necessity or from choice, confined to a district of even narrower limits than the Tarentines; and issuing from it not for purposes of conquest and oppression, but for the holding of peaceful commercial intercourse with the natives, they created the means of a prosperous existence for themselves, and at the same time took the foremost place among the missionaries of Greek civilization in Italy.
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Reference address : https://www.ellopos.net/elpenor/rome/1-10-greeks-italy-tuscans-carthaginians.asp?pg=18