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This is the name of a city mentioned in Ezra 6:2. It was called Ecbatana by classical writers, the capital of northern Media. Here was the palace which was the residence of the old Median monarchs, and of Cyrus and Cambyses.
In the time of Ezra, the Persian kings resided usually at Susa of Babylon. But Cyrus held his court at Achmetha; and Ezra, writing a century after, correctly mentions the place where the decree of Cyrus was found.