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from The American Heritage® Dictionary of the English Language, 4th Edition

  • Darius I Known as "Darius the Great.” 550?-486 B.C. King of Persia (521-486) who expanded the empire, organized a highly efficient administrative system, and invaded Greece, only to be defeated at the Battle of Marathon in 490.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. king of Persia who expanded the Persian Empire and invaded Greece but was defeated at the battle of Marathon (550-486 BC)


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  • Cyrus and his successors vigorously expanded their empire until, under Darius I, who ruled from 521 to 486 B.C., Persian dominion reached from Thrace in southeastern Europe to parts of India, and from southern Egypt to the Caucasus.



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