The new line did not escape the usual fate of Eastern dynasties, of having disputes over the succession, in which their neighbors interfered. In 94 B.C., Dikran or Tigranes II (great-grandson of Wagh-Arshag), owed his possession of the throne of Greater Armenia to his third cousin, Mithridates II (the Great), of Parthia, who exacted seventy Armenian valleys as the price; probably part of Kurdistan. Tigranes, however, paid no more blood-money to anybody when once on the throne. On the contrary, he began at once to overrun and annex the neighboring states. He first conquered Lesser Armenia, and made it one with its sister again; then part of Syria, so long the mistress of his own state; then, in a series of wars with the weak successors of Mithridates, he half destroyed the Parthian Empire itself, not only recovering the seventy valleys he had paid for his throne, but conquering Media, and annexing Mesopotamia and Adiabene. After these conquests he called himself "King of Kings" (that is, emperor, king with other kings under him), which title the Parthian kings had claimed theretofore. He would probably have ended by mastering and restoring the unity of the old Seleucid Kingdom in its widest extent, the whole heart of Western Asia, had he not in an evil hour been induced by that reckless old fighter, his father-in-law, Mithridates of Pontus, to join him in war against the Romans. Tigranes' own son had quarreled with him, and taken refuge with the King of Parthia, whose daughter he married; and now offered to guide his father-in-law into Armenia if he would invade it as the ally of the Romans. This was done, and Tigranes the elder had to fly to the mountains; but the Parthian king grew tired of the siege of rock castles, and went home, leaving his son-in-law to carry on operations with part of the army. The great Armenian king at once broke loose and annihilated the forces of his son, who fled to Pompey, just invading Armenia with the Roman army. Even the great Tigranes was no match for Rome, and had to surrender. Pompey was not harsh with him, but left him Armenia (except Sophene and Gordyene, which were made into a kingdom for his son), and his Parthian conquests; even going so far as to send a Roman division to wrest these from the Parthian king, who had re-conquered them on Tigranes' defeat, and restore them to the latter. On the departure of Pompey the Parthian once more reclaimed them, but a compromise was finally made. Phraates of Parthia, however, resumed once more the title of "King of Kings." Tigranes remained the ally of the Romans till his death in 55 B.C.; a reign of thirty-nine years, on the whole of great glory and usefulness.