Zoroaster

Zarathushtra Spitama, more commonly known as Zoroaster or Zarathustra, was an Iranian religious reformer who challenged the tenets of the contemporary Ancient Iranian religion, becoming the spiritual founder of Zoroastrianism. Variously described as a sage or a wonderworker; in the oldest Zoroastrian scriptures, the Gathas, which he is believed to have authored, he is described as a preacher[g] and a poet-prophet.  He also had an impact on Heraclitus, Plato, Pythagoras, and the Abrahamic religions, including Judaism, Christianity, and Islam.

He spoke an Eastern Iranian language, named Avestan by scholars after the corpus of Zoroastrian religious texts written in that language. Based on this, it is tentative to place his homeland somewhere in the eastern regions of Greater Iran (perhaps in modern-day Afghanistan or Tajikistan), but his exact birthplace is uncertain.

His life is traditionally dated to sometime around the 7th and 6th centuries BC, making him a contemporary of Cyrus the Great, though most scholars, using linguistic and socio-cultural evidence, suggest a dating to somewhere in the second millennium BC. Zoroastrianism eventually became Iran's most prominent religion from around the 6th century BC, enjoying official sanction during the time of the Sassanid Empire, until the 7th century AD, when the religion itself began to decline following the Arab-Muslim conquest of Iran.  Zoroaster is credited with authorship of the Gathas as well as the Yasna Haptanghaiti, a series of hymns composed in Old Avestan that cover the core of Zoroastrian thinking. Little is known about Zoroaster; most of his life is known only from these scant texts. By any modern standard of historiography, no evidence can place him into a fixed period and the historicization surrounding him may be a part of a trend from before the 10th century AD that historicizes legends and myths.

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