This hope likewise was vain; the alliance, on the faith of which Mithradates took the route for Armenia, already by that time existed no longer. During the conflicts between Mithradates and Pompeius just narrated, the king of the Parthians, yielding to the urgency of the Romans and above all of the exiled Armenian prince, had invaded the kingdom of Tigranes by force of arms, and had compelled him to withdraw into the inaccessible mountains. The invading army began even the siege of the capital Artaxata; but, on its becoming protracted, king Phraates took his departure with the greater portion of his troops; whereupon Tigranes overpowered the Parthian corps left behind and the Armenian emigrants led by his son, and re-established his dominion throughout the kingdom Naturally, however, the king was under such circumstances little inclined to fight with the freshly-victorious Romans, and least of all to sacrifice himself for Mithradates; whom he trusted less than ever, since information had reached him that his rebellious son intended to betake himself to his grandfather. 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