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Le·on·i·das I(lē-ŏn′ĭ-dəs) Died 480 bc.
Spartan king (490-480) who led a small force against a huge Persian army at the pass of Thermopylae (480). All of the Spartans, including Leonidas, were killed.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.