Religion in Asia a minority mostly found in India and Iran. It worships a monotheistic god, Ahura Mazda, and was founded by Zoroaster. Zoroastrianism is a religion and philosophy based on the teachings of prophet Zoroaster (also known as Zarathustra, in Avestan), probably founded some time before the 6th century BC. The term Zoroastrianism is, in general usage, essentially synonymous with Mazdaism, i.e., the worship of Ahura Mazda, exalted by Zoroaster as the supreme divine authority. In Zoroastrianism, the Creator Ahura Mazda is all good, and no evil originates from Him. Thus, in Zoroastrianism good and evil have distinct sources, with evil (druj)
Zoroaster 330 BCE. The Seleucid rulers who gained power following Alexander's death instituted an "Age of Alexander" as the new calendrical epoch. This did not appeal to the Zoroastrian priesthood who then attempted to establish an "Age of Zoroaster". To do so, they needed to establish when Zoroaster had lived, which they accomplished by (erroneous, some even identified Cyrus with Vishtaspa) counting back the length of successive generations, until they concluded that Zoroaster must have lived "258 years before Alexander". This estimate then re-appeared in the 9th- to 12th-century Arabic and Pahlavi texts of Zoroastrian tradition, like the 10th century Al-Masudi