Ancient Persian religion was a polytheistic faith which corresponds roughly to what is known today as ancient Persian mythology. It first developed in the region known as Greater Iran (the Caucasus, Central Asia, South Asia, and West Asia) but became focused in the area now known as Iran at some point around the 3rd millennium BCE.
More about: Ancient Persian ReligionDefinition
Timeline
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c. 3000 BCEPersian religious belief is developed.
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c. 1500 BCE - c. 1000 BCEZoroaster develops his new vision of religious truth which becomes Zoroastrianism.
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c. 550 BCE - 330 BCEZoroastrianism adopted by the Achaemenid Empire.
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247 BCE - 224 CEZoroastrianism continued by the Parthian Empire.
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224 CE - 651 CEZoroastrianism made state religion under the Sassanian Empire.
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224 CE - 651 CEThe religious "heresy" of Zorvanism, first suggested under the Achaemenid Empire, is fully developed during the Sassanian Period.
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651 CEMuslim Arab conquest of Persia; Zoroastrianism/Zorvanism is suppressed and forcible conversion efforts instituted.