Cerberus

Cerberus is the hound that keeps the dead inside Hades, and the twelfth labour of Heracles is to bring him up alive. Apollodorus puts the mouth of the descent at Taenarum in Laconia, the cape at the end of the Mani, and gives the dog three heads; Hesiod, three centuries earlier, gives him fifty. Pausanias went to Taenarum, found no road leading underground, and reported the explanation of Hecataeus instead: a poisonous serpent lived there and was called the hound of Hades because its bite killed at once.

In short

Hesiod calls Cerberus the brazen-voiced hound of Hades, fifty-headed, who eats raw flesh, and makes him the offspring of Echidna and Typhaon (Theogony 311).
Apollodorus gives him three heads and a serpent's tail, and makes fetching him alive from Hades the twelfth labour of Heracles.
Apollodorus places the mouth of the descent to Hades at Taenarum in Laconia, the cape at the end of the Mani peninsula.
Pausanias records a temple like a cave on the promontory of Taenarum, with a statue of Poseidon in front of it, and the harbours of Achilleius and Psamathus beside it.
Pausanias says there is no road leading underground through that cave, and that he does not find it easy to believe the gods keep an underground dwelling where the souls collect.
Hecataeus of Miletus, quoted by Pausanias, held that a terrible serpent lived on Taenarum and was called the hound of Hades because anyone bitten died of the poison at once, and that this was the animal Heracles brought to Eurystheus.

The last animal Eurystheus demands

Heracles reaches Cerberus without the weapons that have carried him through the other labours. Hades permits the capture only if the hero masters the dog bare-handed. Heracles closes his arms around the animal’s heads, endures the biting serpent on its tail and does not release his grip until Cerberus yields. He brings the guardian into daylight, shows him to Eurystheus and then returns him below.

This is a capture, not a killing. Cerberus belongs at the boundary because the dead must not leave Hades, and the labour suspends that function only long enough for one mortal ruler to inspect him. Heracles can overpower the guard; he cannot keep him from the underworld without undoing the order the dog protects.

The head count ancient poets never fixed

Hesiod makes Cerberus a child of Echidna and Typhaon and gives him fifty heads. He is brazen-voiced, relentless and impossible to overcome. Apollodorus reduces the count to three dog heads, then adds a dragon’s tail and snakes rising along his back. A note to that text preserves Pindar’s count of one hundred.

The familiar three-headed figure is therefore one ancient version, not the earliest description. What remains constant is the office rather than the anatomy: Cerberus is the hound of Hades, frightening enough that bringing him alive concludes the sequence of Heracles’s tasks.

The road down through Tainaron

Before the descent, Apollodorus has Heracles seek initiation at Eleusis and purification for killing Centaurs. He then travels to Tainaron in Laconia, where the text places the mouth of Hades. The dead flee as he enters. He attempts to draw his sword against Medusa until Hermes reminds him that she is only a shade, and he finds Theseus and Pirithous held fast below.

Tainaron fixes the labour to the end of the Mani peninsula, but the cape was also sacred to Poseidon. Pausanias describes two harbours flanking the promontory and a cave-like temple with Poseidon’s statue in front. A mythic road to the dead and a visible sanctuary of the sea god occupy the same ground without becoming the same cult.

Why Pausanias rejected the cave

Pausanias reports the poets’ claim and then refuses it. No road, he says, leads underground through the structure at Tainaron, and he finds it difficult to believe that the gods maintain a subterranean dwelling where souls assemble. His visit records a cave-like building, not an entrance he accepts as physical evidence for Hades.

He prefers an explanation attributed to Hecataeus of Miletus. A deadly snake lived on the cape and was called the hound of Hades because its poison killed anyone it bit; Heracles brought that creature to Eurystheus. Hecataeus keeps the dangerous animal and the place but removes the underworld journey. At Tainaron, the road down survives in Apollodorus while Pausanias ends at Poseidon’s statue and a cave that goes nowhere.

The two accounts also give the cape different kinds of authority. Apollodorus needs Tainaron as the point where a living man crosses into the realm of the dead. Pausanias trusts what the structure and terrain allow him to see, then preserves the older explanation without accepting it. His doubt does not erase Cerberus from the place; it records why an ancient visitor thought another animal might stand behind the name.

The cave remains visible. The road does not.

Where to stand

Mani

Peloponnese

Cape Tainaron, at the end of the Mani, is where Apollodorus puts the mouth of the descent to Hades and where Heracles goes down to fetch Cerberus. Pausanias saw a temple like a cave on the promontory with a statue of Poseidon in front of it, and wrote that no road leads underground through it, giving instead the account of Hecataeus, that a poisonous serpent lived on the cape and was called the hound of Hades.
Mani