Short answer. The Saoshyant (Avestan for "one who brings benefit") is Zoroastrianism's future savior, who completes the Frashokereti, the final renewal of the world. The Avesta names him Astvat-ereta and says he raises the dead and abolishes evil (Yasht 19.88-96). The full version (three saviors, a bodily resurrection, a last judgment) appears only in later Pahlavi texts (9th century).
A word before it was a person: "the one who brings benefit"
In the Gathas, the oldest layer of the Avesta attributed to Zarathustra himself, saoshyant is not yet a singular messiah. It is a common noun (from the Avestan root sū-, "to bring benefit, to be strong") and it appears in the plural. The saoshyants are the prophet's own helpers, the righteous who labor to advance Asha (Yasna 48.12; Yasna 46.3). Mary Boyce argued the term may have first applied to Zarathustra's own mission and community before it crystallized into a title (A History of Zoroastrianism, vol. 1, 1975). That trajectory (from "benefactors, plural and present" to "the Benefactor, singular and future") is the whole story in miniature. The savior of Zoroastrianism began as a job description for the faithful, not a person waiting offstage. Only in the Younger Avesta does Saoshyant harden into a proper name for a specific eschatological figure (Yasht 13.129).
Astvat-ereta: "He Who Embodies Truth"
The fully named savior is Astvat-ereta: roughly "He who makes Truth (Asha) corporeal," who gives Righteousness a body. The Zamyad Yasht describes his rising: he comes forth from Lake Kansaoya, xᵛarənah (divine glory) upon him, and "will make the world perfect, ageless, deathless, undecaying, ever-living, ever-prospering" while the Lie, Druj, perishes (Yasht 19.88-96). His mother is named in the tradition as Eredat-fedhri, nicknamed Vispa-taurvairi, "She who overcomes all." The conception is strange and deliberate: the seed of Zarathustra is preserved in the waters of the lake, guarded across the ages by fravashis (guardian spirits), and a virgin who bathes there conceives the savior (Denkard 7.10.15ff). The savior of the world is thus the prophet's own descendant: Zoroastrianism keeps salvation inside the family tree of revelation rather than importing it from elsewhere.
Three saviors, not one, and a resurrection of the body
Later tradition multiplies the figure into a sequence. Across three millennia, three sons of Zarathustra arrive in turn (Ushedar, Ushedar-mah, and finally Astvat-ereta, the Saoshyant proper) each pushing back evil further until the last completes the work. This scheme, and the climactic events, are detailed not in the Avesta but in the Pahlavi Bundahishn (chs. 30, 34) and related texts. There the renovation becomes concrete: the dead are raised in the very bodies they wore in life, the bones reassembled and reclothed in flesh; all humanity passes through a river of molten metal that purges the wicked yet feels to the saved like warm milk; Ahriman and the Lie are destroyed, hell itself is purified, and existence is made frasha ("wonderful") forever. This is one of the earliest fully articulated visions of a bodily resurrection and universal restoration in the religious record (see Norman Cohn, Cosmos, Chaos and the World to Come, 1993).
Does this prove the Jewish Messiah and Christ came from here?
This is where honesty earns its keep. The structural rhymes with later Jewish and Christian expectation are real and striking: a divinely-aided deliverer, a resurrection of the dead, a final judgment by fire, a remade and deathless world. But the dating is the problem. The systematic Zoroastrian eschatology (the three saviors, the bodily resurrection, the molten-metal ordeal) survives in detail only in texts redacted in the 9th-12th centuries CE, long after the New Testament. The Gathic and Younger Avestan kernels are old, but reconstructing exactly what a Persian under Cyrus or in Second Temple times believed about the Saoshyant requires reading the later books backward, and scholars dispute how far that is legitimate (Albert de Jong, Traditions of the Magi, 1997). What we can say is measured: there is a resonance you can lean on, not an influence you can bank. The savior-shaped hole in the Western imagination has an old Iranian neighbor, but neighbor is not ancestor, and we will not pretend the family record is clearer than it is.
Common questions
What does "Saoshyant" mean?
It is Avestan for "one who brings benefit," from the root sū-, "to bring benefit, to be strong." In the Gathas it is not yet a singular messiah but a common noun in the plural: the saoshyants are the prophet's own helpers, the righteous who labor to advance Asha. Only in the Younger Avesta does Saoshyant harden into a proper name for a specific future figure. The savior of Zoroastrianism began as a job description for the faithful, not a person waiting offstage.
Who is Astvat-ereta?
Astvat-ereta is the fully named savior, roughly "He who makes Truth (Asha) corporeal," who gives Righteousness a body. The Zamyad Yasht describes him rising from Lake Kansaoya with xᵛarənah (divine glory) upon him, making the world perfect, ageless, and deathless while the Lie perishes (Yasht 19.88-96). His mother is named Eredat-fedhri, nicknamed Vispa-taurvairi, "She who overcomes all."
Is the Saoshyant born from a virgin?
The tradition tells it this way, though the detail comes from a later text (Denkard 7.10.15ff). The seed of Zarathustra is preserved in the waters of Lake Kansaoya, guarded across the ages by fravashis (guardian spirits), and a virgin who bathes there conceives the savior. The savior of the world is thus the prophet's own descendant: Zoroastrianism keeps salvation inside the family tree of revelation rather than importing it from elsewhere.
Did the Jewish Messiah and Christ come from the Saoshyant?
This is where honesty earns its keep. The structural rhymes are real and striking, a divinely-aided deliverer, a resurrection of the dead, a final judgment by fire, a remade world, but the dating is the problem. The systematic Zoroastrian eschatology (three saviors, bodily resurrection, the molten-metal ordeal) survives in detail only in texts redacted in the 9th-12th centuries CE, long after the New Testament. There is a resonance you can lean on, not an influence you can bank: neighbor is not ancestor.
This page traces a genuine figure and a genuine pattern; it does not certify a line of descent. The Saoshyant is bedrock Zoroastrian doctrine, but its earliest systematic form reaches us late, and that gap is the honest center of the whole comparison.
Sources
Yasna 46.3; 48.12; Yasht 13.129; Yasht 19.88-96 (Zamyad Yasht); Denkard 7.10.15ff; Bundahishn 30, 34. Mary Boyce, _A History of Zoroastrianism_, vol. 1 (1975); Albert de Jong, _Traditions of the Magi_ (1997); Norman Cohn, _Cosmos, Chaos and the World to Come_ (1993).