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
It is no matter of wonder therefore that the Achaeans settled in Italy exercised less influence on its civilization than the other Greek settlements. An agricultural people, they had less occasion than those engaged in commerce to extend their influence beyond their political bounds.
Within their own dominions they enslaved the native population and crushed the germs of their national development as Italians, while they refused to open up to them by means of complete Hellenization a new career. In this way the Greek characteristics, which were able elsewhere to retain a vigorous vitality notwithstanding all political misfortunes, disappeared more rapidly, more completely, and more ingloriously in Sybaris and Metapontum, in Croton and Posidonia, than in any other region; and the bilingual mongrel peoples, that arose in subsequent times out of the remains of the native Italians and Achaeans and the more recent immigrants of Sabellian descent, never attained any real prosperity. This catastrophe, however, belongs in point of time to the succeeding period.
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Reference address : https://www.ellopos.net/elpenor/rome/1-10-greeks-italy-tuscans-carthaginians.asp?pg=15