An ancient Persian prophet who founded the dualistic religion Zoroastrianism around the 10th century BC. He is said to have had a revelation in which he saw a being who taught him about two primal spirits: a benevolent creator named Ahura Mazda and a malevolent spirit named Angra Mainyu or Ahriman. Zoroaster also learned about the concepts of asha and druj, roughly equivalent to 'truth' and 'falsehood,' and thereafter chose to dedicate his life to promoting asha.