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Range of traditional dating of Zoroaster's birth and origin of the Gathas
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Recent scholarly dating of Zoroaster's birthday: Gathas follow.
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Zoroastrianism spreads in Persia.
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Persian empire founded.
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Alexander the Great conquers the Persian empire
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Movement to India, founding of Parsi community
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Mongols invade Iran, persecute Zoroastrians
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Decree forcing Iranian Zoroastrians to convert to Islam: more fight to India
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Afghan invades thousands of Zoroastrians.
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Gathas are translated to English
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First fire temple in America is built.
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More than twelve formal Zoroastrian associations formed in the United States.
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Reformist Zarathushtrian Assembly is established in the US.