Artabanus II was the next monarch, but after him the title of king of kings was taken by the Armenian Tigranes, one of the most dangerous foes Parthia ever had. In 86 B.C. it was still a reason for choosing Tigranes, as king of part of Syria, that he was in alliance with Parthia; but very soon the latter state was so ruined by civil and foreign war, that it was no match for Armenia. In 77 B.C. the Arsacid Sinatruces took the throne. Tigranes conquered Media, ravaged the country of Arbela and Nineveh, and compelled the cession of Adiabene and Mesopotamia. Phraates III succeeded his father, Sinatruces, after a period of hesitating neutrality, accepted the overtures of Pompey, and prepared to invade Armenia (66 B.C.), guided by the younger Tigranes, who had quarrelled with his father and taken refuge in Parthia, where he wedded the daughter of the king. Tigranes the elder fled to the mountains; and Phraates turned homeward, leaving young Tigranes with part of the army to continue the war. The latter, who alone was no match for his father, fled after an utter defeat to Pompey, who was just preparing to invade Armenia, and to whom the elder Tigranes presently surrendered at discretion. The Roman, however, gave him very good terms, altogether abandoned his son’s cause, and even put him in chains. Meantime Phraates had occupied the Parthian conquests of Tigranes, which the Romans had promised him, and sent an embassy to Pompey to intercede for his son-in-law. But the Romans had no further occasion for Parthian help; and, instead of granting his request, sent Afranius to clear the country and restore it to Tigranes. Immediately afterwards Pompey’s officer marched into Syria through Mesopotamia, which by treaty had been expressly recognised as Parthian; and it was another grievous insult that Pompey in writing to Phraates had withheld from him the title of king of kings. About 57 B.C. Phraates, the restorer of the empire, was murdered by his two sons, one of whom, Orodes or Hyrodes I, took the throne, while his brother Mithridates III got Media; but the latter ruled so cruelly that he was expelled by the Parthian nobles, and Orodes reigned alone. ORODES DEFEATS THE ROMANS