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Darius created the Persian Royal Road, new techniques of governing a large kingdom, satraps for each region, a uniform coin, and much more for Persia. He is called the greatest Achaemenid emperor in history.
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Greek cities under Achaemenid rule rebel against the empire and large fleets of Greek solders invaded the Persians land.
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Alexander and an army of around forty thousand men defeat the Achaemenid army during the battle of Gaugamela to later take over Prespolis effectively ending the Achaemneid Empire.
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Alexander dies of an unknown illness shortly after he defeated the Achaemenid empire
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The Parthians gained complete independence from the Seleucids and expanded their power to Mesopotamia.
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