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
On the other hand the king's lieutenant Diodorus, a philosopher of note like Aristion, of another school, but equally available for the worst subservience, under the instructions of his master caused the whole town-council of Adramyttium to be put to death. The Chians, who were suspected of an inclination to Rome, were fined in the first instance in 2000 talents (480,000 pounds) and, when the payment was found not correct, they were en masse put on board ship and deported in chains under the charge of their own slaves to the coast of Colchis, while their island was occupied with Pontic colonists.
The king gave orders that the chiefs of the Celts in Asia Minor should all be put to death along with their wives and children in one day, and that Galatia should be converted into a Pontic satrapy. Most of these bloody edicts were carried into effect either at Mithradates' own headquarters or in Galatia, but the few who escaped placed themselves at the head of their powerful tribes and expelled Eumachus, the governor of the king, out of their bounds. It may readily be conceived that such a king would be pursued by the daggers of assassins; sixteen hundred men were condemned to death by the royal courts of inquisition as having been implicated in such conspiracies.
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Reference address : https://www.ellopos.net/elpenor/rome/4-08-east-king-mithradates.asp?pg=61