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 Goes to Panticapaeum
Accordingly king Mithradates was left to himself and to destiny. As formerly his ancestor, the founder of the Pontic state had first entered his future kingdom as a fugitive from the executioners of Antigonus and attended only by six horsemen, so had the grandson now been compelled once more to cross the bounds of his kingdom and to turn his back on his own and his fathers' conquests. But for no one had the dice of fate turned up the highest gains and the greatest losses more frequently and more capriciously than for the old sultan of Sinope; and the fortunes of men change rapidly and incalculably in the east.
Well might Mithradates now in the evening of his life accept each new vicissitude with the thought that it too was only in its turn paving the way for a fresh revolution, and that the only thing constant was the perpetual change of fortune. Inasmuch as the Roman rule was intolerable for the Orientals at the very core of their nature, and Mithradates himself was in good and in evil a true prince of the east, amidst the laxity of the rule exercised by the Roman senate over the provinces, and amidst the dissensions of the political parties in Rome fermenting and ripening into civil war, Mithradates might, if he was fortunate enough to bide his time, doubtless re-establish his dominion yet a third time.
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Reference address : https://www.ellopos.net/elpenor/rome/5-04-pompeius-east.asp?pg=23