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
Pompeius at Artaxata - Peace with Tigranes
Almost without meeting resistance he arrived in the region of Artaxata (not far from Erivan) and pitched his camp thirteen miles from the city. There he was met by the son of the great-king, who hoped after the fall of his father to receive the Armenian diadem from the hand of the Romans, and therefore had endeavoured in every way to prevent the conclusion of the treaty between his father and the Romans. The great-king was only the more resolved to purchase peace at any price. On horseback and without his purple robe, but adorned with the royal diadem and the royal turban, he appeared at the gate of the Roman camp and desired to be conducted to the presence of the Roman general.
After having given up at the bidding of the lictors, as the regulations of the Roman camp required, his horse and his sword, he threw himself in barbarian fashion at the feet of the proconsul and in token of unconditional surrender placed the diadem and tiara in his hands. Pompeius, highly delighted at a victory which cost nothing, raised up the humbled king of kings, invested him again with the insignia of his dignity, and dictated the peace. Besides a payment of; 1,400,000 pounds (6000 talents) to the war-chest and a present to the soldiers, out of which each of them received 50 -denarii- (2 pounds 2 shillings), the king ceded all the conquests which he had made, not merely his Phoenician, Syrian, Cilician, and Cappadocian possessions, but also Sophene and Corduene on the right bank of the Euphrates; he was again restricted to Armenia proper, and his position of great-king was, of course, at an end.
In a single campaign Pompeius had totally subdued the two mighty kings of Pontus and Armenia. At the beginning of 688 there was not a Roman soldier beyond the frontier of the old Roman possessions; at its close king Mithradates was wandering as an exile and without an army in the ravines of the Caucasus, and king Tigranes sat on the Armenian throne no longer as king of kings, but as a vassal of Rome. The whole domain of Asia Minor to the west of the Euphrates unconditionally obeyed the Romans; the victorious army took up its winter-quarters to the east of that stream on Armenian soil, in the country from the upper Euphrates to the river Kur, from which the Italians then for the first time watered their horses.
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Reference address : https://www.ellopos.net/elpenor/rome/5-04-pompeius-east.asp?pg=16