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
Character of the Greek Immigration
The history of the Italian and Sicilian Greeks forms no part of the history of Italy; the Greek colonists of the west always retained the closest connection with their original home and participated in the national festivals and privileges of Greeks.
But it is of importance even as bearing on Italy, that we should indicate the diversities of character that prevailed in the Greek settlements there, and at least exhibit some of the leading features which enabled the Greek colonization to exercise so varied an influence on Italy.
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Reference address : https://www.ellopos.net/elpenor/rome/1-10-greeks-italy-tuscans-carthaginians.asp?pg=10