Efialte

This name derives from the Ancient Greek “ephiáltēs (ἐφιάλτης),” meaning “nightmare,” which in turn derives from “ephàllomai (ἐφάλλομαι).” The name composed of two elements: “epí (ἐπῐ́)” (upon, on) plus “állomai (ἅλλομαι)” (assault, climb, uphill, Jumping, jump) because, about a popular belief, the nightmares were nicknamed “one who climbed over the body of the dormant.” Ephialtes was the son of Eurydemus of Malis. He betrayed his homeland, in the hope of receiving some reward from the Persians, by showing the Persian forces a path around the allied Greek position at the pass of Thermopylae, which helped them win the Battle of Thermopylae in 480 BC.