Zoroastrianism was the official religion of the:

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Zoroastrianism was the official religion of the Persian Empire, which was an ancient empire that existed from the 6th century BC to the 4th century BC. It was founded by Cyrus the Great and expanded by his successors, including Darius I and Xerxes I. The religion played a significant role in Persian culture and was practiced by many of its rulers and citizens. Zoroastrianism originated in ancient Persia, and was the official religion of the Persian Empire. It continued to be the predominant religion in the region until the Arab conquest of Persia in the 7th century, after which Islam became the predominant religion.

Zoroastrianism Was the Official Religion of The