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
Time of the Greek Immigration
The dates of the earlier voyages and settlements will probably always remain enveloped in darkness. We may still, however, distinctly recognize a certain order of sequence. In the oldest Greek document, which belongs, like the earliest intercourse with the west, to the lonians of Asia Minor--the Homeric poems--the horizon scarcely extends beyond the eastern basin of the Mediterranean.
Sailors driven by storms into the western sea might have brought to Asia Minor accounts of the existence of a western land and possibly also of its whirlpools and island-mountains vomiting fire: but in the age of the Homeric poetry there was an utter want of trustworthy information respecting Sicily and Italy, even in that Greek land which was the earliest to enter into intercourse with the west; and the story-tellers and poets of the east could without fear of contradiction fill the vacant realms of the west, as those of the west in their turn filled the fabulous east, with their castles in the air.
In the poems of Hesiod the outlines of Italy and Sicily appear better defined; there is some acquaintance with the native names of tribes, mountains, and cities in both countries; but Italy is still regarded as a group of islands. On the other hand, in all the literature subsequent to Hesiod, Sicily and even the whole coast of Italy appear as known, at least in a general sense, to the Greeks. The order of succession of the Greek settlements may in like manner be ascertained with some degree of precision.
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Reference address : https://www.ellopos.net/elpenor/rome/1-10-greeks-italy-tuscans-carthaginians.asp?pg=7