Zoroaster
founder of Zoroastrianism

Zoroaster, also known as Zarathustra, Zarathushtra Spitama, or Ashu Zarathushtra, is regarded as the spiritual founder of Zoroastrianism. He is said to have been an Iranian prophet who founded a religious movement that challenged the existing traditions of ancient Iranian religion, and inaugurated a movement that eventually became a staple religion in ancient Iran. He was a native speaker of Old Avestan and lived in the eastern part of the Iranian plateau but his exact birthplace is uncertain.
Reference: Wikipedia