In Greek mythology, Achilles (also Akhilleus or Achilleus) (Ancient Greek: Άχιλλεύς) was a hero of the Trojan War, the central character and greatest warrior of Homer's Iliad, which takes for its theme, not the War of Troy in its entirety, but specifically the Wrath of Achilles.
Later legends (beginning with a poem by Statius in the first century AD) state that Achilles was invulnerable on all of his body except for his heel. These legends state that Achilles was killed in battle by an arrow to the heel, and so an Achilles' heel has come to mean a person's only weakness.
Achilles is also famous for being the most 'handsome' of the heroes assembled at Troy, as well as the fleetest. Central to his myth is his relationship with Patroclus, characterized in different sources as deep friendship or love.