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2334 BCE - 2083 BCE: Position of provincial governors is established by the Akkadian Empire.
745 BCE - 727 BCE: Neo-Assyrian king Tiglath Pileser III revises and implements Akkadian model of government.
647 BCE: Akkadian/Assyrian system of government adopted by the Medes under Phraortes.
550 BCE - 330 BCE: Achaemenid Empire of Persia refines the earlier system of satraps.
377 BCE - 353 BCE: Reign of Mausolus, semi-independent satrap of Caria.
312 BCE - 63 BCE: Seleucid Empire adopts Achaemenid system of Persian government but with Greek satraps.
247 BCE - 224 CE: Parthia adopts satrapy system but decentralizes the government which weakens the empire.
224 CE - 651 CE: Sassanian Empire adopts satrapy system and founds its principles on religion of Zoroastrianism/Zorvanism.