Zoroastrianism
Zoroastrianism is an ancient Iranian religious tradition traditionally associated with the prophet Zarathustra, known in Greek as Zoroaster. Its teachings give a central role to Ahura Mazda and to human choices between truth and falsehood; scholars describe its theology as containing both monotheistic and dualistic elements. The tradition is preserved in the Avesta and practiced today by communities in Iran, India and the diaspora. Because the earliest evidence is fragmentary, the date and details of its origins remain debated.
Origins and historical evidence
Zoroastrianism developed from the religious world of ancient Iranian-speaking peoples. Zarathustra—also called Zoroaster, the Greek form of his name—is traditionally regarded as its founding prophet and reformer. The evidence for his life is limited, however, and scholars disagree about when and where he lived. Proposals for his date range from the thirteenth century BCE to shortly before the rise of the Achaemenid Empire in the mid-sixth century BCE; many specialists have favored a date around 1000 BCE. The surviving sources also make it difficult to separate the prophet’s teachings from the religious traditions that developed around them over subsequent centuries.
Teachings and ethical themes
Zoroastrian thought gives a prominent place to Ahura Mazda, often translated as “Wise Lord.” The Gathas, the oldest hymns in the Avesta and traditionally attributed to Zarathustra, present a religious vision centered on Ahura Mazda and on a moral opposition between aša (truth or right order) and druj (falsehood). Human beings are understood to have a meaningful part in this struggle through their choices and conduct. Zoroastrianism is often described as both monotheistic and dualistic: it gives supremacy to a single god while also emphasizing the conflict between good and evil. The precise relationship among these ideas changed over time, so no single summary captures every historical school or community.
The Avesta and oral transmission
The Avesta is the collection of Zoroastrian sacred texts, composed in the ancient Iranian language called Avestan. It includes hymns, prayers, ritual texts and other works that were composed at different times. Much of the tradition was transmitted orally before being collected, edited and written down; the extant Avesta is only part of the larger body of material known in antiquity. Its oldest textual layer includes the Gathas, poetic hymns traditionally linked to Zarathustra. Later priestly commentaries and Middle Persian writings also shaped how the texts were interpreted and preserved.
Worship and ritual
Prayer, recitation and priest-led ceremonies are important parts of Zoroastrian practice. The Yasna is a central ritual in which sacred texts are recited. A fire temple, or ātaškada, is a consecrated building that houses a sacred fire; its use is connected with reverence for purity and the divine. The familiar description of Zoroastrians as “fire-worshippers” can therefore be misleading: fire has a sacred role in worship, but it is not simply treated as an independent god. Ritual forms and institutions have changed across periods and communities.
Historical development
Zoroastrianism evolved as it spread across the Iranian world and interacted with older local traditions. Its relationship to the Achaemenid kings is debated: inscriptions attest to devotion to Ahura Mazda, but scholars do not agree that every Achaemenid ruler followed Zarathustra’s religion in the same sense. Under the Sasanian Empire, founded in the third century CE, Zoroastrian institutions became closely connected with royal authority and a more organized priesthood. After the Sasanian state fell to Arab Muslim forces in the seventh century, the religion gradually lost its former political dominance, though it survived in Iran and in communities elsewhere.
Parsis and Zoroastrian communities today
From about the tenth century onward, groups of Zoroastrians migrated from Iran to Gujarat in western India. Their descendants became known as Parsis and developed a distinct community while maintaining religious and cultural ties to the wider tradition. Zoroastrian communities remain in Iran and India, and migration has also established diaspora communities in other regions.
Key facts
- Traditional founder
- Zarathustra, also known by the Greek form of his name, Zoroaster.
- Origins
- An ancient Iranian religious tradition; the location and date of Zarathustra’s life remain disputed.
- Supreme deity
- Ahura Mazda, commonly translated as “Wise Lord.”
- Sacred texts
- The Avesta, a collection of texts in the Avestan language; the Gathas are among its oldest sections.
- Central ethical theme
- The opposition between aša (truth or right order) and druj (falsehood), with human choices playing a part.
- Fire temples
- Consecrated places that house a sacred fire; the fire has ritual significance and is not simply an independent object of worship.
- Living communities
- Zoroastrians live in Iran, India and diaspora communities; Parsis are a historically distinct community rooted in India.
Timeline
13th to mid-6th century BCE (proposed range)
Scholars have proposed dates for Zarathustra across this range; many have favored a date around 1000 BCE, but the evidence does not settle the question.
c. 224 CE
The Sasanian dynasty rose to power; under the Sasanians, Zoroastrian institutions became closely linked with the state.
651 CE
The Sasanian Empire fell following the Arab conquest of Iran, after which Zoroastrianism gradually lost political dominance but continued to survive.
From the 10th century CE
Groups of Zoroastrians migrated to Gujarat; their descendants became known as Parsis.
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References
- 1.ZOROASTRIANISM i. HISTORICAL REVIEW UP TO THE ARAB CONQUEST
Encyclopaedia Iranica Foundation · other · reliability: high · retrieved 20 October 2026
Supports: Scholarly account of early Iranian religious context, uncertainties about Zarathustra’s date and location, historical development, Sasanian institutions and survival after the Arab conquest.
- 2.Zoroastrianism
Encyclopaedia Britannica · other · reliability: high · retrieved 20 October 2026
Supports: Overview of the tradition, its founder, theological elements, history in Iran and the development of Parsi communities in India.
- 3.Zoroastrianism, an introduction
Smarthistory (originally published by the British Library) · other · reliability: high · retrieved 20 October 2026
Supports: An introduction by Zoroastrian-text scholar Almut Hintze on religious beliefs, the Avesta, ritual practice and the Iranian and Parsi communities.
- 4.AVESTA i. Survey of the history and contents of the book
Encyclopaedia Iranica Foundation · other · reliability: high · retrieved 20 October 2026
Supports: Scholarly reference on the Avesta as a collection of Zoroastrian sacred texts, its language, compilation and surviving manuscript tradition.
- 5.GATHAS i
Encyclopaedia Iranica Foundation · other · reliability: high · retrieved 20 October 2026
Supports: Scholarly reference on the structure and texts of the Gathas, a major body of Old Avestan hymns.
- 6.ĀTAŠKADA
Encyclopaedia Iranica Foundation · other · reliability: high · retrieved 20 October 2026
Supports: Defines the Zoroastrian consecrated building known as a house of fire and discusses the history of temple worship.
- 7.Fire Temple
World History Encyclopedia · other · reliability: high · retrieved 20 October 2026
Supports: Explains fire temples, the ritual meaning of fire and why the phrase “fire-worship” can mischaracterize the role of fire in Zoroastrian practice.
- 8.Zoroastrians in India and Iran
The Pluralism Project, Harvard University · other · reliability: high · retrieved 20 October 2026
Supports: Describes the historical development of Iranian and Parsi communities and the presence of Zoroastrians in Iran, India and the diaspora.
References are suggested by the research engine and may be incomplete. Unverified URLs are omitted rather than guessed.
Article history
- Version 220 October 2026 · EditorUpdated by Zapia
- Version 120 October 2026 · EditorCreated by Zapia