Tigranes V was accompanied by his maternal grandfather, Archelaus of Cappadocia and the future Roman emperor Tiberius to Armenia, where he was installed as King at Artaxata. Artaxata became Tigranes V's capital. In 6, Tigranes V ruled Armenia as a sole ruler. Sometime into his reign, the Armenian nobles being unsatisfied with his reign rebelled against Tigranes V. The same Armenian nobles restored Erato back to the Armenian throne. Erato wanting to cooperate with Rome, co-ruled with Tigranes V. Her co-rule with Tigranes V is known and based from numismatic evidence. Erato and Tigranes V co-ruled together in Artaxata. There is a possibility that Erato and Tigranes V may have married and she may have served as a Queen consort to Tigranes V.