Zoroaster lower right corner. The prophet is holding a star-studded globe. Zoroaster Zoroaster (, ; "Zōroastrēs"), (Persian: زرتشت pronounced as Zartusht) also known as Zarathustra (, ; "Zaraθuštra"), Zarathushtra Spitama, or Ashu Zarathushtra, was an ancient Persian prophet, spiritual leader and ethical philosopher who taught a spiritual philosophy of self-realization and realization of the Divine. His teachings challenged the existing traditions of the Indo-Iranian religion and later developed into the religion of Mazdayasna or Zoroastrianism. He inaugurated a movement that eventually became the dominant religion in Ancient Persia. He was a native speaker of Old Avestan and lived in the eastern
Zoroaster and Darius I. Zoroastrianism eventually became the official religion of Ancient Persia and its distant subdivisions from the 6th century BCE to the 7th century CE. Zoroaster is credited with authorship of the Gathas as well as the Yasna Haptanghaiti, hymns composed in his native dialect, Old Avestan, and which comprise the core of Zoroastrian thinking. Most of his life is known from these 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 that historicizes legends