So he entered into negotiations with the Romans for a separate peace; but he did not wait for the conclusion of the treaty to break off the alliance which linked him to Mithradates.

The latter, when he had arrived at the frontier of Armenia, was doomed to learn that the great-king Tigranes had set a price of 100 talents (24,000 pounds) on his head, had arrested his envoys, and had delivered them to the Romans.

King Mithradates saw his kingdom in the hands of the enemy, and his allies on the point of coming to an agreement with them; it was not possible to continue the war; he might deem himself fortunate, if he succeeded in effecting his escape along the eastern and northern shores of the Black Sea, in perhaps dislodging his son Machares--who had revolted and entered into connection with the Romans( 6)--once more from the Bosporan kingdom, and in finding on the Maeotis a fresh soil for fresh projects.
So he turned northward.

When the king in his flight had crossed the Phasis, the ancient boundary of Asia Minor, Pompeius for the time discontinued his pursuit; but instead of returning to the region of the sources of the Euphrates, he turned aside into the region of the Araxes to settle matters with Tigranes.
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.