High Quality Content by WIKIPEDIA articles! Zoroaster or Zarathushtra, was an ancient Iranian prophet and religious poet. THe hymns attributed to him, the Gathas, are at the liturgical core of Zoroastrianism. AVestan Zara u tra is generally accepted to derive from an Old Iranian zarat-u tra-, which might in turn be a zero-grade form of zarant-u tra-. THis is supported by reconstructions from later Iranian languages in particular from Middle Persian Zartosht, which is the form the name has in the ninth- to twelfth-century Zoroastrian texts.