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
Meanwhile the complaints became daily more numerous and more urgent. The princes of the Tauric Scythians, whom Mithradates had driven from the Crimea, turned for help to Rome; those of the senators who at all reflected on the traditional maxims of Roman policy could not but recollect that formerly, under circumstances so wholly different, the crossing of king Antiochus to Europe and the occupation of the Thracian Chersonese by his troops had become the signal for the Asiatic war,(11) and could not but see that the occupation of the Tauric Chersonese by the Pontic king ought still less to be tolerated now.
11. Cf. III. IX. Rupture between Antiochus and the Romans
The scale was at last turned by the practical reunion of the kingdom of Cappadocia, respecting which, moreover, Nicomedes of Bithynia-- who on his part had hoped to gain possession of Cappadocia by another pseudo-Ariarathes, and now saw that the Pontic pretender excluded his own--would hardly fail to urge the Roman government to intervention.
The senate resolved that Mithradates should reinstate the Scythian princes--so far were they driven out of the track of right policy by their negligent style of government, that instead of supporting the Greeks against the barbarians they had now on the contrary to support the Scythians against those who were half their countrymen. Paphlagonia was declared independent, and the pseudo- Pylaemenes of Nicomedes was directed to evacuate the country. In like manner the pseudo-Ariarathes of Mithradates was to retire from Cappadocia, and, as the representatives of the country refused the freedom proffered to it, a king was once more to be appointed by free popular election.
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Reference address : https://www.ellopos.net/elpenor/rome/4-08-east-king-mithradates.asp?pg=28