What became the chief religion of the Persians by the middle of the sixth century b.c.e.?

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Zoroastrianism became the chief religion of the Persians by the middle of the sixth century BCE. It was founded by the prophet Zoroaster and emphasized the dualistic concept of good and evil, with the ultimate goal of eliminating evil and promoting good. The religion remained the dominant faith of the Persian Empire until the Arab conquest in the seventh century CE.

What Became the Chief Religion of the Persians by the Middle