Initially, Tigranes ruled Armenia as a sole ruler but the Armenian nobles were dissatisfied with this situation and restored Queen Erato back to the throne as Tigranes' co-ruler. Tigranes' co-rule with Erato is supported by numismatic evidence.
At first, Tigranes governed Armenia alone, but the Armenian aristocracy objected to this and brought Queen Erato back as a co-ruler alongside Tigranes. Evidence from coins supports their joint reign.