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
The culture of corn and the fisheries of the Sea of Azov had rapidly raised the city to prosperity. Its territory still in the time of Mithradates embraced the lesser eastern division of the Crimea including the town of Theodosia, and on the opposite Asiatic continent the town of Phanagoria and the district of Sindica. In better times the lords of Panticapaeum had by land ruled the peoples on the east coast of the Sea of Azov and the valley of the Kuban, and had commanded the Black Sea with their fleet; but Panticapaeum was no longer what it had been. Nowhere was the sad decline of the Greek nation felt more deeply than at these distant outposts.
Athens in its good times had been the only Greek state which fulfilled there the duties of a leading power--duties which certainly were specially brought home to the Athenians by their need of Pontic grain. After the downfall of the Attic maritime power these regions were, on the whole, left to themselves. The Greek land-powers never got so far as to intervene seriously there, although Philip the father of Alexander and Lysimachus sometimes attempted it; and the Romans, on whom with the conquest of Macedonia and Asia Minor devolved the political obligation of becoming the strong protectors of Greek civilization at the point where it needed such protection, utterly neglected the summons of interest as well as of honour.
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Reference address : https://www.ellopos.net/elpenor/rome/4-08-east-king-mithradates.asp?pg=18