A member of the ancient Persian dynasty that ruled a vast empire from around 550 to 330 BCE, known for their advanced administration and military power.
From Old Persian Hakhamanish, the founder of the dynasty. The Greek form Achaemenes was used by classical historians. The term passed through Greek and Latin into English historical terminology.
The Achaemenids created one of history's first truly multinational empires—they even let conquered peoples keep their own religions and languages, which was revolutionary for the time and made their empire easier to rule and harder to rebel against.
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