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
Aquillius Sent to Asia
The Roman government, appealed to for aid by the kings Ariobarzanes and Nicomedes in person, despatched to Asia Minor in support of Lucius Cassius who was governor there the consular Manius Aquillius-- an officer tried in the Cimbrian and Sicilian wars--not, however, as general at the head of an army, but as an ambassador, and directed the Asiatic client states and Mithradates in particular to lend armed assistance in case of need.
The result was as it had been two years before. The Roman officer accomplished the commission entrusted to him with the aid of the small Roman corps which the governor of the province of Asia had at his disposal, and of the levy of the Phrygians and Galatians; king Nicomedes and king Ariobarzanes again ascended their tottering thrones; Mithradates under various pretexts evaded the summons to furnish contingents, but gave to the Romans no open resistance; on the contrary the Bithynian pretender Socrates was even put to death by his orders (664).
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Reference address : https://www.ellopos.net/elpenor/rome/4-08-east-king-mithradates.asp?pg=32