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1500 BCE
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1500 BCE - 1000 BCE: The Zoroastrian Avesta is developed in oral form.
550 BCE - 330 BCE: Avesta informs the policies of the Achaemenid Persian Empire.
247 BCE - 224 CE: Avesta continues to inform Parthian Empire.
224 CE - 651 CE: Avesta is committed to writing under the Sassanian Empire who make Zoroastrianism the state religion.
651 CE: Copies of Avesta and other Zoroastrian works destroyed during Muslim Arab Conquest.