Zoroastrianism, the smallest of the world's great religions, is also one of the oldest. Founded more than 3,000 years ago by the prophet Zarathustra, it flourished in ancient Persia during the time of the Persian Empire. Scholars have long acknowledged the contributions of Zoroastrianism to other faiths, including Judaism, Christianity, Islam, and Buddhism. Concepts such as the notion of one God, heaven and hell, the dualism of good and evil, a savior to come, and everlasting life can trace their roots to the religion of Zarathustra. ""Zoroastrianism, Third Edition"" traces the history and beliefs of Zoroastrianism and its followers' determination through centuries of persecution and hardship into the present day. The Iranian and Indian Zoroastrian communities in which the religion has thrived without missionary efforts or vast numbers of believers is also explored. The coverage includes: the message of the prophet Zarathustra; the sacred fire; Zoroastrianism throughout history; the Zoroastrian scripture, the Avesta; rituals, beliefs, and rites of passage; and, traditional versus updated Zoroastrianism.