The Hydra

The necks Iolaus closes with fire

Each time Heracles cuts a head from the Hydra, two grow from the open neck. He cannot win by repeating the blow. Iolaus takes burning brands and seals each wound before it can divide, while Heracles works towards the immortal head at the centre. The companion’s solution makes the killing possible and gives Eurystheus a reason to reject it.

A crab joins the Hydra and bites Heracles’s foot. He crushes it, and Hyginus later has Juno place the animal among the stars for its attack. The struggle is therefore not simply hero against beast. Hera has raised the Hydra against Heracles, a second creature intervenes for her, and a mortal ally intervenes for him.

The heads no source could count alike

Hesiod gives the earliest surviving account but no total. The Hydra is a child of Typhon and Echidna, raised by Hera and destroyed by Heracles with Iolaus through Athena’s plan. Euripides likewise calls it many-headed without choosing a number.

Apollodorus counts nine heads, eight mortal and one immortal. Diodorus Siculus gives the creature a hundred necks, each carrying a serpent’s head. These descriptions cannot all represent one fixed anatomy. The growing heads explain why number itself is unstable: every version can increase the threat before Heracles and Iolaus discover how to stop it.

Why the labour did not count

Once the mortal necks are sealed, Heracles cuts off the immortal head, buries it beside the road from Lerna to Elaeus and places a heavy rock above it. He opens the carcass and dips his arrows in its poison. The dead Hydra continues to kill through wounds inflicted in later stories, including the accidental shot that leaves the immortal Centaur Chiron unable to heal.

Eurystheus still refuses to recognise the victory. The original command required Heracles to complete ten labours, and the king declares that the Hydra cannot count because Iolaus supplied the fire. The judgement is technically correct and deliberately punitive. Heracles has defeated a creature designed to replace every loss with two more, but cooperation makes the achievement invalid in the eyes of the man assigning it.

The single serpent Pausanias accepted

At Lerna, Pausanias is shown a plane tree growing over the place where the Hydra was said to have lived, beside the spring of Amymone. He accepts a large and dangerously venomous water snake, enough to explain the poisoned arrows, but rejects the multiple heads. He names Peisander of Camirus as the poet who added them to make both the beast and his poem more impressive.

That judgement is ancient criticism, not archaeology proving the myth. Pausanias sees a claimed location and supplies a naturalised animal. The Ephorate of Antiquities of Argolida now describes the excavated ground as the place where myth set the spring, the bottomless Alkyonian lake and the Hydra’s den. What stands there belongs to much earlier settlement: a Middle Neolithic house and the stone enclosure raised above the Early Bronze Age House of Tiles. The plane tree Pausanias records and the many-headed body are absent; the disagreement over one head, nine or a hundred remains in the texts.

Lerna therefore preserves two separate records. Ancient authors attach a changing monster and a contested count to its water. Excavation exposes houses and enclosures made by people who lived there long before those authors wrote. Neither record turns into proof of the other.