Who betrayed the Greeks?

Answer 1

The Greeks were betrayed by Ephialtes, a local shepherd, during the Battle of Thermopylae in 480 BCE. He informed the Persian forces, led by Xerxes, of a hidden mountain path that allowed them to outflank the Greek forces. This betrayal ultimately led to the encirclement and defeat of the vastly outnumbered Greek soldiers, including the legendary stand of King Leonidas and his Spartans. Ephialtes' actions have since become synonymous with treachery in Greek history.