choosing bishops since it would result in death. The local mobads – Zoroastrian clerics – with the help of satraps organized slaughters of Christians in Adiabene, Beth Garmae, Khuzistan and many other provinces. Yazdegerd I showed tolerance towards Jews and Christians for much of his rule. He allowed Christians to practice their religion freely, demolished monasteries and churches were rebuilt and missionaries were allowed to operate freely. He reversed his policies during the later part of his reign however, suppressing missionary activities. Bahram V continued and intensified their persecution, resulting in many of them fleeing to the eastern Roman empire. Bahram demanded their return, beginning the Roman–Sasanian War of 421–422. The war ended with an agreement of freedom of religion for Christians in Iran with that of Mazdaism in Rome. Meanwhile, Christians suffered destruction of churches, renounced the faith, had their private property confiscated and many were expelled. Yazdegerd II had ordered all his subjects to embrace Mazdeism in an attempt to unite his empire ideologically. The Caucasus rebelled to defend Christianity which had become integrated in their local culture, with Armenian aristocrats turning to the Romans for help. The rebels were however defeated in a battle on the Avarayr Plain. Yeghishe in his The History of Vardan and the Armenian War, pays a tribute to the battles waged to defend Christianity. Another revolt was waged from 481–483 which was suppressed. However, the Armenians succeeded in gaining freedom of religion among other improvements. Accounts of executions for apostasy of Zoroastrians who converted to Christianity during Sasanian rule proliferated from the fifth to early seventh century, and continued to be produced even after collapse of Sasanians. The punishment of apostates increased under Yazdegerd I and continued under successive kings. It was normative for apostates who were brought to the notice of authorities to be executed, although the prosecution of apostasy depended on political circumstances and Zoroastrian jurisprudence. Per Richard E. Payne, the executions were meant to create a mutually recognised boundary between interactions of the people of the two religions and preventing one religion challenging another's viability. Although the violence on Christians was selective and especially carried out on elites, it served to keep Christian communities in a subordinate and yet viable position in relation to Zoroastrianism. Christians were allowed to build religious buildings and serve in the government as long as they did not expand their institutions and population at