sentences:  The kingdom became fully sovereign from the sphere of influence of the Seleucid Empire in 190 BC under King Artaxias I and begun the rule of the Artaxiad dynasty.Armenia reached its height between 95 and 66 BC under Tigranes the Great, becoming the most powerful kingdom of its time east of the Roman Republic.In the next centuries, Armenia was in the Persian Empire's sphere of influence during the reign of Tiridates I, the founder of the Arsacid dynasty of Armenia, which itself was a branch of the Parthian Empire.