In 224 AD, during the reign of Ardashir I, gave a new name for the Sassanid empire. Ardashir I formed orderly and steady government, made Zoroastrianism a state religion. The overpower of Sassanid brought to the clash with Rome. Rome lost to the battle with Sassanid. Eastern Rome was under the control of Palmyra, a caravan city in Syria. At the end of the reign of Shapur I, the Sassanid empire relocated their kingdom from Euphrates river to the Indus river and included modern-day Armenia and Georgia. During the short period of territory lost, the Sassanid empire was repaired in the region of Shapur II (310-379). At that time the east of Kushans was under control and had a war with the Arabs. Once again there was conflict with Rome control of northern Mesopotamia and Armenia. In the fifth century, while Sassanid was forced to pay tribute to their eastern neighbors, in Iran, after the death of king Khusran had revolts and wars with the Byzantine empire. Finally, under the control of Islam, they terminated the opulence of the Sassanid empire in 624 CE.