Persian Government Timeline

Reign of Cyrus the Great in which he borrows from earlier empires to form government model for Achaemenid Empire.

Reign of Darius I The Great; model of Achaemenid Empire's government is revised and refined.

Seleucid Empire adopts the model of the Persian Achaemenid Empire's government.

Parthian Empire adopts Persian model of government with some modifications.

Sassanian Empire adopts Persian model of government but bases it on religion of Zoroastrianism.