Achilles in Wikipedia

In Greek mythology, Achilles (Ancient Greek: Ἀ÷éeeåýò, Achilleus) was a Greek hero of the Trojan War, the central character and the greatest warrior of Homer's Iliad. Achilles also has the attributes of being the most handsome of the heroes assembled against Troy. Later legends (beginning with a poem by Statius in the first century AD) state that Achilles was invulnerable in all of his body except for his heel. Since he died due to an arrow shot into his heel, the term "Achilles' heel" has come to mean a person's principal weakness...

Link: https://en.wikipedia.org/wiki/Achilles