The Achilles Heel: How the Greatest Greek Warrior Died

Almost everyone knows the phrase “Achilles heel” — a single, hidden weakness in something otherwise strong. Fewer people know that the story behind it is not found in Homer at all. The Iliad presents an Achilles who is mortal from head to foot, who bleeds when wounded, and who knows he will die young. The famous image of a baby dipped in the River Styx, held by the heel, and made invulnerable everywhere else is a later development, fully attested only in Roman literature. How that story grew — and why it proved so durable — says a great deal about the way myths evolve.

The Story as Usually Told

In the familiar version, the sea-nymph Thetis, knowing that her son was fated to die at Troy, sought to make him immortal. She carried the infant Achilles down to the River Styx, the boundary river of the underworld whose waters were said to bestow invulnerability, and dipped him in it. To keep hold of the child she gripped him by one heel, and so that single spot was never touched by the water.

Years later, in the tenth year of the Trojan War, the Trojan prince Paris shot an arrow at Achilles. The god Apollo, who hated Achilles for killing his favourite, Troilus, and for defiling Hector’s body, guided the shaft. It struck the one unprotected place, and the greatest warrior of the Greeks fell dead before the Scaean Gate.

What Homer Actually Says

Homer’s Achilles is not invulnerable. In Book 21 of the Iliad, the Trojan ally Asteropaeus hits him in the forearm with a spear, and “the dark blood gushed out.” Achilles needs armour; he is terrified of losing his first set to Hector and delighted by the second set forged by Hephaestus. A hero who could not be wounded would have no use for a shield.

Homer is also clear about how Achilles will die, even though he does not narrate it. As Hector lies dying, he prophesies that Paris and Apollo will kill Achilles at the Scaean Gate. Achilles’s own horse Xanthus, granted speech by Hera for a moment, makes the same prediction. The Iliad never mentions the heel.

The Epic Cycle and Early Art

The lost poem Aethiopis, part of the Epic Cycle that continued Homer’s story, described the death of Achilles. According to a later summary, Achilles routed the Trojans, rushed into the city, and was killed by Paris and Apollo. The summary does not say where he was hit.

Archaic Greek vase painters, however, seem to have known a tradition in which the wound was in the lower leg or ankle. A sixth-century BCE Chalcidian amphora (now lost, but recorded in drawings) showed Achilles lying dead with an arrow through his ankle. This suggests that the heel or ankle as the site of the fatal wound is quite old — even if the reason for its vulnerability came later.

Fire, Not Water: The Older Immortality Story

The earliest account of Thetis trying to make her son immortal involves fire, not the Styx. In the Argonautica of Apollonius of Rhodes (third century BCE), Thetis burned away the mortal flesh of the infant each night and anointed him with ambrosia each day. When Peleus saw his son writhing in the flames he cried out, and Thetis, furious at being interrupted, left him forever. The same story is told of the goddess Demeter, who tried to immortalize the baby prince Demophon at Eleusis in the same way and was likewise interrupted.

In some versions of the fire story, the only part of Achilles left mortal was his heel — because Thetis had been interrupted before she finished, or because the heel-bone was burnt away and Peleus asked Chiron to replace it with the bone of the swift giant Damysus. Achilles’s legendary speed came from that borrowed bone; when Apollo guided Paris’s arrow into it, the bone gave way.

Statius and the River Styx

The version everyone knows was first set down in detail by the Roman poet Statius in his unfinished epic Achilleid (c. 95 CE). Thetis herself recalls dipping her son in the waters of the Styx. Statius does not dwell on the heel, but the image of the mother holding her child by the foot is implicit, and later writers — notably the mythographer Servius and the medieval commentators who drew on him — made it explicit.

By the Middle Ages this was the standard story. It passed into Renaissance mythological handbooks and from there into the modern imagination.

Why the Heel?

Why should the most powerful body in Greek legend fail at its lowest point? Several explanations have been proposed.

The logic of the story. A mother holding a baby by the ankle to dip it is simply how one would do it. The weakness is where the hand was.
The heel as the seat of speed. Achilles is podarkēs, “swift-footed,” in Homer. It is fitting that the source of his greatest gift should also be the source of his death.
A wider pattern of single weak spots. World myth is full of near-invulnerable heroes with one flaw. The Norse Baldr can be harmed only by mistletoe. The Germanic hero Siegfried bathes in dragon’s blood but a linden leaf falls between his shoulder blades. The Persian hero Esfandiyār, made invulnerable by bathing in a sacred river, is killed by an arrow in the eyes. The Irish Diarmuid can be killed only through the sole of his foot. The pattern expresses a simple truth: nothing mortal is perfectly protected.

The Death Before the Scaean Gate

Accounts differ on the circumstances. In the version known to Homer and the Aethiopis, Achilles died in battle while pressing the Trojans back towards the city. A later and more romantic tradition, found in the Trojan War narratives of Dictys and Dares (late antique prose accounts claiming to be eyewitness histories), says Achilles fell in love with Priam’s daughter Polyxena and went unarmed to the temple of Thymbraean Apollo to negotiate a marriage. There Paris, hiding behind the statue of the god, shot him treacherously.

After his death, the Greeks demanded that Polyxena be sacrificed on Achilles’s tomb — a story dramatized by Euripides in Hecuba and The Trojan Women.

The Fight for the Body and the Armour

Achilles’s death set off one of the fiercest battles of the war as the Trojans tried to strip his armour and the Greeks to recover his body. Ajax, the giant of the Greek army, lifted the corpse and carried it back to the ships while Odysseus fought off the pursuers. The funeral lasted seventeen days. The Nereids rose from the sea to mourn, and the nine Muses sang the lament.

The armour made by Hephaestus was to go to the bravest of the Greeks. Ajax and Odysseus both claimed it; the prize went to Odysseus, and Ajax, maddened by the insult, slaughtered a flock of sheep believing them to be the Greek commanders, then fell on his sword.

The Achilles Tendon

The term Achilles tendon (tendo Achillis) was coined by the Flemish anatomist Philip Verheyen in 1693. According to a popular story, Verheyen dissected his own amputated leg and named the thick tendon connecting the calf muscles to the heel-bone after the hero. The name stuck, and today it is used in medical textbooks worldwide. Injury to the tendon, appropriately, can bring down the fittest athlete in a moment.

A Metaphor for Every Age

The phrase “Achilles heel” as a metaphor for a single fatal weakness appears in English from at least the early nineteenth century; Samuel Taylor Coleridge used it in 1810 to describe Ireland as England’s vulnerable point. Today it is applied to everything from military strategy to software security.

The idea endures because it captures something true. Strength is rarely total. The greatest hero, the strongest fortress, the most sophisticated system, often fails at exactly the point no one thought to protect — and often at the very place where it was held.

Last reviewed: September 2026.