The predominant religion in the ancient Persian Empire was Zoroastrianism. Founded by the prophet Zoroaster (or Zarathustra), this ancient religion emphasized the duality of good and evil, the worship of Ahura Mazda as the supreme deity, and the importance of moral choice. Zoroastrianism played a crucial role in shaping the culture and governance of the Persian Empire, influencing its values and policies. It contributed to the development of religious concepts that would later shape other major faiths, including themes of judgment and an afterlife. The empire's tolerance for various beliefs also allowed other religions to flourish.