Paris Kills Achilles or Paride diretto da Apollo Ferince Achille, Book XIII, illustration from Ovid's...

P. Ovidii Nasonis Metamorphoseon Libri XV cum Appositis Italico Carmine* Interpretationibus ac Notis, 5 Vols (Florence, 1824, repr. 1832); Book XII: Paris: son of Priam, king of Troy; eloped with Helen, queen of Sparta, one of the causes of the Trojan War. Later in the war, he fatally wounds Achilles in the heel with an arrow, as foretold by Achilles's mother, Thetis. Achilles: Greek hero of the Trojan War: Achilles was invulnerable in all of his body except for his heel. As he died because of a small wound on his heel, the term Achilles' heel has come to mean a person's principal weakness.