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
All the Armenian Conquests Pass into the Hands of the Romans
All the provinces wrested from the Parthians or Syrians to the south of the Tigris were by this means strategically lost to the Armenians, and passed, for the most part, without delay into the possession of the victor. The newly-built second capital itselfset the example. The Greeks, who had been forced in large numbers to settle there, rose against the garrison and opened to the Roman army the gates of the city, which was abandoned to the pillage of the soldiers. It had been created for the new great-kingdom, and, like this, was effaced by the victor. From Cilicia and Syria all the troops had already been withdrawn by the Armenian satrap Magadates to reinforce the relieving army before Tigranocerta.
Lucullus advanced into Commagene, the most northern province of Syria, and stormed Samosata, the capital; he did not reach Syria proper, but envoys arrived from the dynasts and communities as far as the Red Sea--from Greeks, Syrians, Jews, Arabs--to do homage to the Romans as their sovereigns. Even the prince of Corduene, the province situated to the east of Tigranocerta, submitted; while, on the other hand, Guras the brother of the great-king maintained himself in Nisibis, and thereby in Mesopotamia. Lucullus came forward throughout as the protector of the Greek princes and municipalities: in Commagene he placed Antiochus, a prince of the Seleucid house, on the throne; he recognized Antiochus Asiaticus, who after the withdrawal of the Armenians had returned to Antioch, as king of Syria; he sent the forced settlers of Tigranocerta once more away to their homes.
The immense stores and treasures of the great-king--the grain amounted to 30,000,000 -medimni-, the money in Tigranocerta alone to 8000 talents (nearly 2,000,000 pounds)--enabled Lucullus to defray the expenses of the war without making any demand on the state-treasury, and to bestow on each of his soldiers, besides the amplest maintenance, a present of 800 -denarii- (33 pounds).
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Reference address : https://www.ellopos.net/elpenor/rome/5-02-rule-sullan-restoration.asp?pg=47