 Theodore eventually concluded a truce with then governor of Syria, Muawiyah I in 651, and Arabs concentrated their efforts against the remaining pockets of resistance in the Sassanid Empire.Finally, by 652 Rshtuni, despairing of further resistance, accepted Muawiyah's suzerainty and was appointed ruler of Armenia.Rshtuni was able to negotiate a treaty that left Armenia with a relatively high level of autonomy.