The Revelation to Zarathustra

Zoroastrian tradition holds that Zarathustra, known in Greek as Zoroaster, received his revelation from Ahura Mazda, the Wise Lord, at the age of thirty, while drawing water from a river for a spring purification ritual. In the encounter, Zarathustra is said to have been led into the presence of Ahura Mazda and several attendant divine beings, the Amesha Spentas, who revealed to him the nature of the cosmic struggle between truth, asha, and falsehood, druj, and commissioned him to teach humanity how to align itself with the former.

The clearest and earliest evidence for Zarathustra's teaching survives in the Gathas, seventeen hymns composed in an archaic form of Avestan and later incorporated into the Yasna, the central liturgical text of the Avesta. The Gathas present a demanding ethical monotheism centered on Ahura Mazda as the sole uncreated creator god, opposed not by an equal rival power but by the destructive principle of falsehood that human beings choose to align with or against through their own thought, word and deed.

Zarathustra's teaching met resistance in his own lifetime according to tradition, and his early following remained small until, in the fullest form of the story, a local ruler named Vishtaspa accepted the new faith and extended it royal protection, allowing it to establish itself and eventually spread across the Iranian world.

When Zarathustra lived is one of the most persistently disputed questions in the study of ancient Iranian religion. A traditional chronology, recorded in later Zoroastrian sources, places him two hundred and fifty eight years before Alexander's conquest of Persia, which would put his life in the sixth century BCE, contemporary with the early Achaemenid Persian empire. Linguistic analysis of the Gathas, however, points to a considerably earlier date: the archaic form of Avestan in which they are composed, and the pastoral, tribal society the hymns describe, resemble the world of the Rigveda far more than they resemble the urbanized, imperial Iran of the sixth century BCE, leading many specialists to favor a date somewhere between about 1500 and 1000 BCE instead.

Neither dating rests on independent, externally verifiable evidence in the way that later, better documented periods of Iranian history do, and the disagreement is not simply a matter of preferring one ancient source over another, since the traditional date and the linguistic evidence point in genuinely different directions rather than toward a single reconcilable range. Some scholars have proposed that the later traditional date reflects a real historical figure, perhaps a reformer or systematizer working within an older Zoroastrian tradition, being retrospectively identified with the original prophet, though this remains one hypothesis among several rather than a settled resolution.

The uncertainty over Zarathustra's date is compounded by the near total absence of independent, non-Zoroastrian evidence for his life, leaving the Gathas themselves, read primarily as religious and linguistic evidence rather than as biography, as the main basis scholars have for locating him in time at all.