# Zoroastrianism > How Zoroastrianism began among Iranian herders, what Zarathustra taught in the Gathas about Ahura Mazda, truth and the lie, judgement and renewal, its place under the Achaemenid and Sasanian kings, the debated influence of its ideas on Judaism, Christianity and Islam, its survival after the Arab conquest in Yazd and Kerman, the Parsis of India, and Zoroastrians and Nowruz today. Episode 04 of the Origins of Religions series. Interactive film: https://www.planetpast.com/stories/religion-zoroastrianism/ Publisher: PlanetPast (https://www.planetpast.com/) · Published 2026-10-13 · Religion, History ## Prologue ### Zoroastrianism *Origins of Religions · Episode 04* Truth against the lie. In the city of Yazd in Iran, a sacred fire has been kept burning, by tradition, for over 1,500 years. Zoroastrians pray facing a source of light, as a symbol of their god’s wisdom and purity. Today there are only around 100,000 to 200,000 Zoroastrians, mostly in India, where they are called Parsis, and in Iran. Yet for more than a thousand years this was the faith of great empires. Prologue · Episode 04 of the Origins of Religions series #### A small faith with a long reach - **Zoroastrians today**: ~110,000–200,000 estimates vary - **Largest communities**: India, Iran, North America Zoroastrians do not worship fire; fire is a symbol and a focus of prayer. Sources: [Wikipedia: Zoroastrianism by country (FEZANA 2012 survey)](https://en.wikipedia.org/wiki/Zoroastrianism_by_country); [Britannica: Zoroastrianism](https://www.britannica.com/topic/Zoroastrianism) ## Chapter I · The prophet ### A world of cattle raiders *Chapter I · c. 1500–1000 BC* The society Zarathustra was born into. Zarathustra, called Zoroaster by the Greeks, lived among Iranian-speaking herders somewhere in Central Asia or eastern Iran. His language, Avestan, is a close cousin of the Sanskrit of the Rigveda. His people shared gods and rituals with the Vedic Indians. But in Iran, the word daeva came to mean demon, while in India deva means god. His hymns describe a violent world of cattle raids and warrior bands. Scholars date him anywhere from about 1500 to 500 BC; many favour around 1200 to 1000 BC, from the archaic language of his hymns. Chapter I · Step 1 #### A world of cattle raiders - Avestan Sister language of Vedic Sanskrit - ahura / asura “lord”: good in Iran, demonic in later India - daeva / deva demon in Iran, god in India Zoroastrian tradition places the prophet much earlier or later in different sources; there is no scholarly consensus. Sources: [Encyclopaedia Iranica: Zoroaster](https://www.iranicaonline.org/articles/zoroaster-i-the-name) ### The wise lord and the choice *Chapter I · the teaching* Good thoughts, good words, good deeds. Zarathustra’s own words survive in seventeen hymns, the Gathas. He taught that there is one supreme, wise and good god, Ahura Mazda. The world is the scene of a struggle between asha, truth and right order, and druj, the lie. Every person must freely choose a side, with good thoughts, good words and good deeds. After death, each soul crosses the Chinvat bridge, which becomes broad for the righteous and narrow as a blade for the wicked. At the end of time a saviour will come, the dead will rise, and the world will be made perfect again. These were remarkably new ideas. Chapter I · Step 2 #### The wise lord and the choice - Ahura Mazda The wise lord - Asha / Druj Truth and order / the lie - Humata, hukhta, hvarshta Good thoughts, good words, good deeds - Frashokereti The final renewal of the world Sources: [Wikipedia: Gathas](https://en.wikipedia.org/wiki/Gathas); [Britannica: Zoroastrianism](https://www.britannica.com/topic/Zoroastrianism) ## Chapter II · Faith of empires ### The Persian kings *Chapter II · 550–330 BC* By the favour of Ahuramazda. The Achaemenid kings of Persia built the largest empire the world had yet seen. In his great inscription at Behistun, around 520 BC, Darius I says he rules “by the favour of Ahuramazda”. Whether the early Persian kings followed Zarathustra’s teaching in full is debated, but they honoured the same god. They also tolerated other religions. Cyrus allowed the Jews exiled in Babylon to return to Jerusalem and rebuild their temple, in 538 BC. The Bible calls him God’s anointed. Chapter II · Step 3 #### The Persian kings - 550 BC Cyrus founds the Achaemenid Empire - 538 BC Return of Jewish exiles - c. 520 BC Behistun inscription of Darius I - 330 BC Alexander burns Persepolis Sources: [UNESCO: Bisotun](https://whc.unesco.org/en/list/1222/); [Britannica: Zoroastrianism](https://www.britannica.com/topic/Zoroastrianism) ### Ideas that travelled *Chapter II · after 538 BC* Angels, devils and the last judgement. Under Persian rule, Jewish writings began to speak more of angels and a chief adversary, Satan, of the resurrection of the dead, and of a final judgement. Many scholars think contact with Zoroastrian ideas contributed to this. Others stress developments within Judaism itself. The question is still debated. Through Judaism, these ideas passed into Christianity and Islam. In the Gospel of Matthew, the wise men from the east who visit the infant Jesus are magi, the Persian word for Zoroastrian priests. Chapter II · Step 4 #### Ideas that travelled - Heaven and hell Judgement of each soul - Resurrection The dead rise at the end of time - Saviour A world-renewing figure to come - Magi Persian priests, in the Gospel of Matthew Zoroastrianism has sometimes been called the first monotheism; scholars debate whether its dualism of good and evil fits that label. Sources: [Wikipedia: Zoroastrianism, influence on other religions](https://en.wikipedia.org/wiki/Zoroastrianism#Influence_on_other_religions_and_cultures) ### The Sasanian church *Chapter II · 224–651* A state religion. When the Sasanian dynasty took power in Iran in 224, Zoroastrianism became a state religion with a powerful priesthood. The high priest Kartir had inscriptions carved boasting of his campaigns against other faiths. Great fire temples were founded, like Adur Gushnasp at Takht-e Soleyman. The Avesta, long passed on by memory, was finally written down in a special alphabet, probably in the 5th or 6th century. Rivals appeared: the prophet Mani, born in 216, founded Manichaeism, a religion of light and darkness that spread from Rome to China before dying out. Chapter II · Step 5 #### The Sasanian church - 224 Sasanian dynasty - 3rd c. High priest Kartir - 5th–6th c. Avesta written down - 216–274 Mani, founder of Manichaeism Sources: [UNESCO: Takht-e Soleyman](https://whc.unesco.org/en/list/1077/); [Wikipedia: Manichaeism](https://en.wikipedia.org/wiki/Manichaeism) ## Chapter III · Survival ### After the conquest *Chapter III · 651–1500* A slow conversion. Arab Muslim armies defeated the Sasanians, and the last king died in 651. Zoroastrians became a protected but taxed minority. Conversion to Islam was gradual, taking several centuries. Zoroastrian communities survived longest in the desert cities of Yazd and Kerman. They kept their rituals, including exposing the dead on towers of silence, so that earth and fire would not be polluted. Chapter III · Step 6 #### After the conquest - 651 End of the Sasanian Empire - 9th–10th c. Pahlavi religious books compiled - Yazd, Kerman Last Iranian strongholds Sources: [Britannica: Zoroastrianism](https://www.britannica.com/topic/Zoroastrianism) ### The Parsis of India *Chapter III · 8th–19th c.* Sugar in the milk. A group of Zoroastrians sailed to Gujarat in India, according to the Qissa-i Sanjan, a later poem; dates between the 8th and 10th centuries are proposed. They became known as Parsis, “Persians”. Legend says a local king showed them a full bowl of milk: there was no room. Their priest added sugar, to show they would sweeten the land without overflowing it. Under British rule, Parsis in Bombay became leading merchants, industrialists and reformers, out of all proportion to their small numbers. Chapter III · Step 7 #### The Parsis of India - 8th–10th c. Arrival at Sanjan (date debated) - Udvada Home of the Iranshah fire, India’s oldest - 19th c. Bombay’s Parsi merchants and industrialists Sources: [Wikipedia: Qissa-i Sanjan](https://en.wikipedia.org/wiki/Qissa-i_Sanjan) ### A shrinking community *Chapter III · today* And a festival for 300 million. Zoroastrian numbers are falling, because of low birth rates, emigration and strict rules on marrying outside the faith. Communities debate whether to accept converts. Yet one Zoroastrian festival is celebrated by around 300 million people: Nowruz, the Iranian New Year at the spring equinox, now a UNESCO-listed heritage across Iran, Central Asia and beyond. The winged symbol, the faravahar, has become an emblem of Iranian identity, for people of many faiths. Chapter III · Step 8 #### A shrinking community - **Zoroastrians, 2012 survey**: ~111,000–122,000 - **Nowruz celebrants**: ~300 million Sources: [Wikipedia: Zoroastrianism by country (FEZANA 2012 survey)](https://en.wikipedia.org/wiki/Zoroastrianism_by_country); [UNESCO: Nowruz](https://ich.unesco.org/en/RL/nowruz-01161) ## Epilogue ### The choice *Epilogue* A small flame, a large shadow. Zarathustra asked each person to choose between truth and the lie. That idea of a moral choice with eternal consequences is one of the most influential in the history of religion. Next: Judaism, a faith born among a small people between great empires, whose scriptures would shape Christianity and Islam. Epilogue #### The choice - ?1200 BC Zarathustra and the Gathas - 550–330 BC Achaemenid kings - 224–651 Sasanian state religion - 8th–10th c. Parsis in India #### The series - **00**The Origins of Religions (overview) - **01**The First Beliefs - **02**The Ancient Gods - **03**Hinduism - **04** Zoroastrianism (this film) - **05**Judaism - **06**Buddhism and Jainism - **07**Confucianism and Daoism - **08**Shinto - **09**Christianity - **10** Islam (coming soon) - **11** Sikhism (coming soon) - **12** Spirits, Brahmins and the Buddha: Southeast Asia (coming soon) The still images on the chapter cards are AI-generated illustrations. Outlines are approximate. Sources: [Britannica: Zoroastrianism](https://www.britannica.com/topic/Zoroastrianism); [Encyclopaedia Iranica: Zoroaster](https://www.iranicaonline.org/articles/zoroaster-i-the-name)