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3000 BCE
2500 BCE
2000 BCE
1500 BCE
1000 BCE
500 BCE
0 CE
500 CE
3000 BCE: Persian religious belief is developed.
1500 BCE - 1000 BCE: Zoroaster develops his new vision of religious truth which becomes Zoroastrianism.
550 BCE - 330 BCE: Zoroastrianism adopted by the Achaemenid Empire.
247 BCE - 224 CE: Zoroastrianism continued by the Parthian Empire.
224 CE - 651 CE: Zoroastrianism made state religion under the Sassanian Empire.
224 CE - 651 CE: The religious "heresy" of Zorvanism, first suggested under the Achaemenid Empire, is fully developed during the Sassanian Period.
651 CE: Muslim Arab conquest of Persia; Zoroastrianism/Zorvanism is suppressed and forcible conversion efforts instituted.