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
Mithradates Master of the Bosphoran Kingdom
Such was the state in which Mithradates found matters, when his Macedonian phalanx crossing the ridge of the Caucasus descended into the valleys of the Kuban and Terek and his fleet at the same time appeared in the Crimean waters. No wonder that here too, as had already been the case in Dioscurias, the Greeks everywhere received the king of Pontus with open arms and regarded the half-Hellene and his Cappadocians armed in Greek fashion as their deliverers. What Rome had here neglected, became apparent.
The demands on the rulers of Panticapaeum for tribute had just then been raised to an exorbitant height; the town of Chersonesus found itself hard pressed by Scilurus king of the Scythians dwelling in the peninsula and his fifty sons; the former were glad to surrender their hereditary lordship, and the latter their long-preserved freedom, in order to save their last possession, their Hellenism. It was not in vain. Mithradates' brave generals, Diophantus and Neoptolemus, and his disciplined troops easily got the better of the peoples of the steppes.
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Reference address : https://www.ellopos.net/elpenor/rome/4-08-east-king-mithradates.asp?pg=20