Relating to the ancient Persian empire founded by Achaemenes (around 700 BCE) and lasting until Alexander the Great's conquests, or a person from that empire.
From Greek Achaemenios, named after Achaemenes, the legendary founder of the Persian royal dynasty. The name was preserved by Greek historians describing the Persian Empire.
The Achaemenian Empire was absolutely massive—at its peak under Darius and Xerxes, it stretched from Egypt to India, and invented the first postal system and tolerance of diverse religions across conquered territories.
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