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Ephialtes of Trachis (died 470s BCE) was a Greek individual who betrayed his homeland during the Second Persian invasion of Greece.

In 480 BCE, in hopes of being rewarded by King Xerxes I of Persia, Ephialtes revealed to the Achaemenid Empire a path in Malis that allowed them to go around the allied Greek forces stationed at the narrow passage of Thermopylae. His actions led to the defeat of the combined forces led by King Leonidas I of Sparta at the Battle of Thermopylae.[1]

After the war, a contract was placed on Ephialtes' head and he was eventually hunted down.[1]



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