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Dārayavaʰuš was the birth name of Darius III, the last king of the Achaemenid Empire of Persia. The name translates to "possessing good" or "holding firmly" in Old Persian. Darius III reigned from 336 to 330 BCE, during which time he faced the invasion of Alexander the Great. He was defeated at the Battle of Gaugamela in 331 BCE, marking the end of the Achaemenid Empire.