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
Regulation of Asia Minor
Caesar entrusted the pursuit of the king, who had gone home by way of Sinope to Pharnaces' illegitimate brother, the brave Mithradates of Pergamus, who as a reward for the services rendered by him in Egypt received the crown of the Bosporan kingdom in room of Pharnaces. In other respects the affairs of Syria and Asia Minor were peacefully settled; Caesar's own allies were richly rewarded, those of Pompeius were in general dismissed with fines or reprimands.
Deiotarus alone, the most powerful of the clients of Pompeius, was again confined to his narrow hereditary domain, the canton of the Tolistobogii. In his stead Ariobarzanes king of Cappadocia was invested with Lesser Armenia, and the tetrarchy of the Trocmi usurped by Deiotarus was conferred on the new king of the Bosporus, who was descended by the maternal side from one of the Galatian princely houses as by the paternal from that of Pontus.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=111