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1500 BCE - 1000 BCE: Development of the religion of Zoroastrianism in region of ancient Persia.
1500 BCE - 1000 BCE: Concept of the Chinvat Bridge develops with the religion of Zoroastrianism.
1500 BCE - 1000 BCE: Development of Ahriman in religion of Zoroastrianism.
1500 BCE - 1000 BCE: Zoroaster develops his new vision of religious truth which becomes Zoroastrianism.
1500 BCE - 1000 BCE: Life of Zoroaster according to modern scholar estimations.
628 BCE - 551 BCE: Life of Zoroaster, according to Pahlavi sources.
550 BCE - 330 BCE: Zoroastrianism adopted by the Achaemenid Empire.
550 BCE - 330 BCE: Zoroastrianism is adopted by the Achaemenid Empire.
247 BCE - 224 CE: Zoroastrianism continued by the Parthian Empire.
247 BCE - 224 CE: Zoroastrianism is continued by the Parthian Empire.
224 CE - 651 CE: Avesta is committed to writing under the Sassanian Empire who make Zoroastrianism the state religion.
224 CE - 240 CE: Reign of Ardashir I, who reformed the Persia by centralizing power, making Zoroastrianism state religion, and rivalling Rome.
224 CE - 651 CE: Zoroastrianism made state religion under the Sassanian Empire.
224 CE - 651 CE: Sassanian Empire adopts satrapy system and founds its principles on religion of Zoroastrianism/Zorvanism.
224 CE - 651 CE: Sassanian Empire adopts Persian model of government but bases it on religion of Zoroastrianism.
224 CE: Zoroastrianism becomes Persian state religion under the Sassanian Empire.
309 CE - 379 CE: Zoroastrian religious literature committed to writing under the reign of Shapur II of the Sassanian Empire.
531 CE - 579 CE: Reign of Kosrau I of the Sassanian Empire; Zoroastrian religious works written and codified.
651 CE: Muslim Arab conquest of Persia; Zoroastrianism/Zorvanism is suppressed and forcible conversion efforts instituted.