Ephialtes (of Trachis) discovers the Secret Path at Thermopylae by The English School 19th C. CE

"Misfortunes test friends, and detect enemies."

-Epictetus; Carter, Elizabeth. The Complete Works of Epictetus (p. 422). Lazy Raven Publishing. Kindle Edition. 

Ephialtes (of Trachis) discovers the Secret Path at Thermopylae by The English School 19th C. CE. Illustration for Magna Carta Stories, world famous struggles for freedom in former times recounted for youthful readers, edited by Arthur Gilman (Blackie, c 1890).

Source:

https://www.lookandlearn.com/history-images/M354166/Ephialtes-discovers-the-Secret-Path-at-Thermopylae

Quote:

Epictetus; Carter, Elizabeth. The Complete Works of Epictetus (p. 422). Lazy Raven Publishing. Kindle Edition.