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
Hellenism in That Quarter
In sharp contrast to all these barbarians stood the Greek settlements, which at the time of the mighty impetus given to Greek commerce had been founded chiefly by the efforts of Miletus on these coasts, partly as trading-marts, partly as stations for prosecuting important fisheries and even for agriculture, for which, as we have already said, the north-western shores of the Black Sea presented in antiquity conditions less unfavourable than at the present day.
For the use of the soil the Greeks paid here, like the Phoenicians in Libya, tax and ground-rent to the native rulers. The most important of these settlements were the free city of Chersonesus (not far from Sebastopol), built on the territory of the Scythians in the Tauric peninsula (Crimea), and maintaining itself in moderate prosperity, under circumstances far from favourable, by virtue of its good constitution and the public spirit of its citizens; and Panticapaeum (Kertch) at the opposite side of the peninsula on the straits leading from the Black Sea to the Sea of Azov, governed since the year 457 by hereditary burgomasters, afterwards called kings of the Bosporus, the Archaeanactidae, Spartocidae, and Paerisadae.
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Reference address : https://www.ellopos.net/elpenor/rome/4-08-east-king-mithradates.asp?pg=17