Zarathustra (also given as Zoroaster, Zartosht, Zarathustra Spitama, l. c. 1500-1000 BCE) was the Persian priest-turned-prophet who founded the religion of Zoroastrianism (also given as Mazdayasna “devotion to Mazda”), the first monotheistic religion in the world, whose precepts would come to influence later faiths.
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Definition
Timeline
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c. 1500 BCE - c. 1000 BCELife of Zoroaster according to modern scholar estimations.
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c. 1500 BCE - c. 1000 BCEZoroaster develops his new vision of religious truth which becomes Zoroastrianism.
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628 BCE - 551 BCELife of Zoroaster, according to Pahlavi sources.
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224 CEZoroastrianism becomes Persian state religion under the Sassanian Empire.