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
After the discovery of America the civilized nations of Europe vied with one another in sending out expeditions and forming settlements there; and the new settlers when located amidst barbarians recognized their common character and common interests as civilized Europeans more strongly than they had done in their former home. So it was with the new discovery of the Greeks.
The privilege of navigating the western waters and settling on the western land was not the exclusive property of a single Greek province or of a single Greek stock, but a common good for the whole Greek nation; and, just as in the formation of the new North American world, English and French, Dutch and German settlements became mingled and blended, Greek Sicily and "Great Greece" became peopled by a mixture of all sorts of Greek races often so amalgamated as to be no longer distinguishable.
Leaving out of account some settlements occupying a more isolated position--such as that of the Locrians with its offsets Hipponium and Medama, and the settlement of the Phocaeans which was not founded till towards the close of this period, Hyele (Velia, Elea)--we may distinguish in a general view three leading groups. The original Ionian group, comprehended under the name of the Chalcidian towns, included in Italy Cumae with the other Greek settlements at Vesuvius and Rhegium, and in Sicily Zankle (afterwards Messana), Naxos, Catana, Leontini, and Himera.
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Reference address : https://www.ellopos.net/elpenor/rome/1-10-greeks-italy-tuscans-carthaginians.asp?pg=5