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→The Achaemenid Empire or Achaemenid Persian Empire (Persian: هخامنشیان IPA: [haχɒmaneʃijɒn]) (550–330 BCE) was amongst the first Persian Empires that ruled over significant portions of Greater Iran, followed the Iranian Median Empire. At the height of its power, the Iranian Achaemenid Empire encompassed approximately 6.5 million square kilometers and became the Largest Empire of Ancient World.
The empire was forged by Cyrus the Great, and spanned three continents, including territories of Afghanistan and Pakistan, parts of Central Asia, Asia Minor, Thrace, much of the Black Sea coastal regions, Iraq, northern Saudi Arabia, Jordan, Israel, Lebanon, Syria, and all significant population centers of ancient Egypt as far west as Libya. (Cyrus the Great was killed in 539 BC during a battle in Kapisa, northern Afghanistan[1]) It is noted in western history as the foe of the Greek city states in the Greco-Persian Wars, for freeing the Israelites from their Babylonian captivity, and for instituting Aramaic as the empire's official language. It fell during the Wars of Alexander the Great in 330 BC. Because of the Empire's vast extent and long endurance, Persian influence upon the language, religion, architecture, philosophy, law and government of nations around the world lasts to this day.
The empire began as a tributary state of the Medes but ended up conquering and enlarging the Median empire to include Egypt and Asia Minor. Under Xerxes, it came very close to conquering Ancient Greece. The Achaemenids were overthrown by the conquest of Alexander the Great in 330 BCE.