Hormizd IV

Iranian Emperor Khosrow I maintained a level of religious tolerance (except for Mazdakism), during his reign (531 - 579),. His son was also tolerant.

Hormizd IV (reigned 579 - 590) turned down requests by the Zoroastrian clergy to persecute Christians. His explanation was:

Just as our royal throne cannot stand on its two front legs without the two back ones, our kingdom cannot stand or endure firmly if we cause the Christians and adherents of other faiths, who differ in belief from ourselves, to become hostile to us. So refrain from harming the Christians and become assiduous in good works, so that the Christians and the adherents of other faiths may see this, praise you for it, and feel themselves drawn toward your religion.

He wanted all living within the empire to be treated as citizens of the empire. One of Hormizd's wives was a Christian, and he is said to have prayed to St. Sergius, a 4th-century Christian soldier.

The Zoroastrian clergy were not okay with this, and treated him with hostility. Hormizd felt it prudent to deal with their threat by executing Zoroastrian clergy who opposed him. There was another Zoroastrian threat, however, that did not come from the clergy.

Bahram Chobin was a military leader from one of the Seven Great Houses of the Sassanian Iranian Empire. He started a civil war against Hormizd. The religious element came from a Zoroastrian holy book that predicted:

a man shall come from the frontiers of Kavulistan, with whom there will be glory, also of the royal family, whom they will name Kay Bahram; and all men will return with him, and he will rule even over India, Rome, and Turkistan, over all the frontiers.

Bahram's activities were near the end of the millennium of Zoroaster (which had to have started with the Seleucids in 312 BCE to make this work). Bahram began to be hailed by some as the fulfillment of a prophecy. Bahram himself claimed to be the personification of the fire of Mithra.

Hormizd, of course, had his own army, and the two forces faced each other across a river, neither wanting to make the first move and become vulnerable while trying to cross. Tomorrow I'll tell you what ended the civil war about to take place.