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 cities and islands sent messengers to meet him, wherever he went, and to invite "the delivering god" to visit them; and in festal attire the citizens flocked forth in front of their gates to receive him. Several places delivered the Roman officers sojourning among them in chains to the king; Laodicea thus surrendered Quintus Oppius, the commandant of the town, and Mytilene in Lesbos the consular Manius Aquillius.(12)
12. Retribution came upon the authors of the arrest and surrender of Aquillius twenty-five years afterwards, when after Mithradates' death his son Pharnaces handed them over to the Romans.
The whole fury of the barbarian, who gets the man before whom he has trembled into his power, discharged itself on the unhappy author of the war. The aged man was led throughout Asia Minor, sometimes on foot chained to a powerful mounted Bastarnian, sometimes bound on an ass and proclaiming his own name; and, when at length the pitiful spectacle again arrived at the royal quarters in Pergamus, by the king's orders molten gold was poured down his throat--in order to satiate his avarice, which had really occasioned the war-- till he expired in torture.
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Reference address : https://www.ellopos.net/elpenor/rome/4-08-east-king-mithradates.asp?pg=42