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
Alongside of the kings of Cappadocia and Commagene, and in real power far superior to them, the new king Deiotarus ruled in Asia Minor. One of the tetrarchs of the Celtic stock of the Tolistobogii settled round Pessinus, and summoned by Lucullus and Pompeius to render military service with the other small Roman clients, Deiotarus had in these campaigns so brilliantly proved his trustworthiness and his energy as contrasted with all the indolent Orientals that the Roman generals conferred upon him, in addition to his Galatian heritage and his possessions in the rich country between Amisus and the mouth of the Halys, the eastern half of the former Pontic empire with the maritime towns of Pharnacia and Trapezus and the Pontic Armenia as far as the frontier of Colchis and the Greater Armenia, to form the kingdom of Lesser Armenia.
Soon afterwards he increased his already considerable territory by the country of the Celtic Trocmi, whose tetrarch he dispossessed. Thus the petty feudatory became one of the most powerful dynasts of Asia Minor, to whom might be entrusted the guardianship of an important part of the frontier of the empire.
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Reference address : https://www.ellopos.net/elpenor/rome/5-04-pompeius-east.asp?pg=52