achilles (Ἀχιλλεύς) | a greek hero of the trojan war and the central character and greatest warrior of homer&#x27;s iliad. his mother was the immortal nymph thetis, and his father, the mortal peleus, was the king of the myrmidons. legends state that achilles was invulnerable in all of his body except for his heel. alluding to these legends, the term &quot;achilles heel&quot; has come to mean a point of weakness.