Zoroastrianism is one of the world’s oldest monotheistic religions. Founded in ancient Persia in the 6th century BCE, it gradually overtook local polytheistic faiths. Zoroastrianism was even practiced by Persia’s ruling families. Under the Sasanian empire, which was founded in 224 CE, it was the state’s official religion until the Arab Muslim invasion in 651 CE. The rise of Islam in Persia coincided with a steep decline in Zoroastrian followers; in 2012 there were reportedly between 15,000 and 25,000 followers in modern-day Iran, a country of more than 82 million people. While scholars point to a number of factors explaining this downward trend, there is little doubt that over a thousand years of religious persecution have contributed to Zoroastrianism’s gradual disappearance from its homeland.
The Arab Muslim conquest of Persia meant the end of Zoroastrian control, but it did not immediately result in persecution. In fact, the early caliphs adhered to a general policy of religious tolerance. As dhimmī, or legally protected nonbelievers, Zoroastrians were free to worship Ahura Mazdā without punishment. But in the 7th and 8th centuries the Umayyad caliphs introduced a ban on non-Muslim participation in government, affecting Zoroastrian families who had clung to their lingering Sasanian political power. This ban encouraged many Zoroastrians to leave Persia altogether; a substantial number emigrated to nearby India. Modern-day Parsis descend from this refugee population.
Beginning in the late 8th century the Abbasid caliphs attached new restrictions to the jizyah, a tax that dhimmī paid in exchange for their legal protection. The jizyah ensured freedom of religion and exempted dhimmī from conscription and forced labour. Under the Abbasids, however, dhimmī could not spread their religion or build new temples. They could not bear arms or ride horses. Dhimmī were even required to wear clothes that distinguished them from Muslims. Following the imposition of the jizyah, many Zoroastrians chose to convert to Islam. The rate of conversions accelerated after the Abbasid caliphs moved their capital to Baghdad, leaving the administration of Persia to governors who destroyed ateshkadehs (fire temples) or converted them into mosques.
Abbasid persecution, combined with emigration under the Umayyads, virtually eradicated Zoroastrianism from urban areas. Although some believers remained in the cities of Kermān and Yazd, the religion was largely relegated to rural spaces, which were difficult for state authority to penetrate. But even these areas were no safe haven. Rural Persia suffered enormous destruction in the 13th century at the hands of the Mongols, who toppled the Abbasid caliphate and laid waste to their lands. And between 1502 and 1736, the Safavid dynasty mounted another state-sponsored assault on Zoroastrian religious freedom. There was a renewed effort to demolish or convert places of worship. Urban practitioners were relocated to the capital city and forced to convert to Shī?ah Islam under threat of execution. Many Zoroastrians chose to die as martyrs.
After intense repression, Zoroastrians saw their fortunes increase in the late 19th and early 20th centuries. Under pressure from the British Empire, the Qājār dynasty lifted the longstanding jizyah and eliminated state-sponsored forms of persecution. The Pahlavi family, which ruled from 1925 until 1979, went so far as to openly embrace Persia’s Zoroastrian roots. As part of a new nationalist movement, Reza Shah Pahlavi undertook a massive cultural reorientation of Persia centred on its ancient history. He reverted the country’s name to Iran, as it was referred to by the Sasanians, and renamed the months according to the Zoroastrian calendar. Mohammad Reza Shah Pahlavi continued much of his father’s reconciliatory work, placing a high value on the prophet Zarathustra’s contributions to ancient Persian culture. The shah also enacted a number of social reforms aimed at elevating Zoroastrians to a near-equal status with Muslims.
The Iranian Revolution of 1978–79 brought an abrupt end to this brief reprieve for Zoroastrians. Having violently opposed the shah’s project of toleration and secularization, Ruhollah Khomeini declared Iran a Shī?ah Islamic republic. The country’s new constitution established Zoroastrianism as a religious minority of a legal status similar to the medieval dhimmī. Any constitutional right to religious freedom, however, proved nominal at best. Writing for CNN in 2011, Jamsheed K. Choksy detailed a number of state efforts since the 1979 Revolution that have punished Zoroastrians for refusing to convert. Shortly after Khomeini seized power, Shi?i revolutionaries stormed the main ateshkadeh in Tehrān, tore down images of Zarathustra, and replaced them with portraits of Khomeini. During the next decade’s Iran-Iraq War, Zoroastrian boys were drafted specifically for suicide missions. And while Zoroastrians are constitutionally permitted to provide their youth with a religious education, the curriculum must incorporate state-designed material that denounces non-Muslim faiths and praises the Supreme Leader.
Despite Zoroastrianism’s long history of persecution in Iran under Muslim rule, younger generations have spurred some observers to believe that it may have a brighter future. In a 2014 opinion piece for The New York Times, Camelia Entekhabifard wrote that thousands of Iranians openly celebrated Nowruz, also known as Persian New Year, near the tomb of Cyrus the Great. Cyrus the Great worshipped Ahura Mazdā, the supreme god of both Zoroastrianism and its polytheistic predecessors. Nowruz, a holiday surviving from at least Cyrus’s reign in the 6th century BCE, proudly reflects on Iran’s Zoroastrian heritage. Although the Iranian regime has condemned Nowruz celebrations associated with the holiday’s pre-Islamic roots, public opinion on Zoroastrian cultural influence is changing.