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600 BCE
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600 CE
550 BCE - 530 BCE: Reign of Cyrus the Great in which he borrows from earlier empires to form government model for Achaemenid Empire.
522 BCE - 486 BCE: Reign of Darius I The Great; model of Achaemenid Empire's government is revised and refined.
312 BCE - 63 BCE: Seleucid Empire adopts the model of the Persian Achaemenid Empire's government.
247 BCE - 224 CE: Parthian Empire adopts Persian model of government with some modifications.
224 CE - 651 CE: Sassanian Empire adopts Persian model of government but bases it on religion of Zoroastrianism.