From 87 to 85, Tigran's Army victoriously entered Armenian Mesopotamia [Northern Mesopotamia], the province of Korduk', Migdonia and Adiabenē, which were previously under the control of the Parthians. Th
e kingdoms of Osroyenē and Atrpatakan [Atropatene] also pledged their loyalty and support to Tigran the Great. In 85, the Parthians officially recognized him as the supreme ruler of the East. Tigran took the haled title of King of Kings, from the Parthian monarch, and honorably held it to the end of his life.
In 83, after a bloody strife for the throne of Syria, governed by the Seleucids, the Syrians decided to choose Tigran as the protector of their kingdom and offered him the crown of Syria. Tigran was crowned the same year with the support of the local aristocracy. Tigran conducted an "open" policy of free trade within the Hellenistic metropolitan polis' [cities] of the vast Armenian Empire, granting autonomy to those important cities, who could mint their own currency and were judged according to the local laws and customs. The Syrian mints also issued coins depicting the Emperor, King of Kings Tigran the Great. According to Justin, Tigran reigned for eighteen years on the Syrian throne.thumb|300px|right