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
Thucydides evidently regarded Cumae as the earliest settlement of note in the west; and certainly he was not mistaken. It is true that many a landing-place lay nearer at hand for the Greek mariner, but none were so well protected from storms and from barbarians as the island of Ischia, upon which the town was originally situated; and that such were the prevailing considerations that led to this settlement, is evident from the very position which was subsequently selected for it on the mainland--the steep but well-protected cliff, which still bears to the present day the venerable name of the Anatolian mother-city.
Nowhere in Italy, accordingly, were the scenes of the legends of Asia Minor so vividly and tenaciously localized as in the district of Cumae, where the earliest voyagers to the west, full of those legends of western wonders, first stepped upon the fabled land and left the traces of that world of story, which they believed that they were treading, in the rocks of the Sirens and the lake of Avernus leading to the lower world.
On the supposition, moreover, that it was in Cumae that the Greeks first became the neighbours of the Italians, it is easy to explain why the name of that Italian stock which was settled immediately around Cumae, the name of Opicans, came to be employed by them for centuries afterwards to designate the Italians collectively.
There is a further credible tradition, that a considerable interval elapsed between the settlement at Cumae and the main Greek immigration into Lower Italy and Sicily, and that in this immigration Ionians from Chalcis and from Naxos took the lead. Naxos in Sicily is said to have been the oldest of all the Greek towns founded by strict colonization in Italy or Sicily; the Achaean and Dorian colonizations followed, but not until a later period.
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Reference address : https://www.ellopos.net/elpenor/rome/1-10-greeks-italy-tuscans-carthaginians.asp?pg=8