Amphisbaena

Region/Culture: Southern Europe
Mythos: Greek Mythology, Roman Mythology, Medieval European Mythology
Primary Type/Nature: Monsters and Beasts
Mythical Attributes: A serpent with a head at each end of its body, able to crawl in either direction and pour venom from both mouths.
Role in Mythos: It appears in classical poetry and natural history as one of the venomous serpents of the Libyan desert and later as a stock emblem of double-mindedness in medieval bestiaries.
Relation to Humans: Its bite was reckoned doubly poisonous, and travelers crossing the desert feared meeting it. Its body was also prized in folk medicine, worn live or as a dried skin to guard against chills and to ease pregnancy.

The sand took the blood as it fell. Dark beads spilled from the severed head Perseus carried north over the desert, and where the drops struck the ground something coiled up out of the heat. This was the Libya the Greeks and Romans imagined, a furnace of a country where nothing should live and everything venomous did, and one of the things that crawled from that bloodied ground was a snake with a head at both ends.

That is the version Lucan tells, and it is the most memorable one. Most of the earlier writers were plainer. Nicander, the first to set the creature down, mentioned it almost in passing and called it dull of eye, which is an odd detail to lead with, but Greek naturalists were like that. Aeschylus reached for it as an insult. When his chorus needs a word foul enough for Clytemnestra standing over the husband she has just killed, it asks whether she is an amphisbaena or a Scylla. The name was already shorthand for something that came at you from a direction you were not watching.

The body is a serpent’s, scaled and ordinary until you reach the ends, where instead of a tail there is a second head. The eyes, in the later accounts at least, glow like small lamps. It is not a large animal. The strangeness is entirely in the symmetry, two blunt skulls on one trunk, each as ready to bite as the other, with no proper front and no proper back. Aelian described how it managed this. When it wants to go forward, one head leads and the other trails behind to serve as a tail; when it wants to reverse, the heads simply swap their duties and it travels the other way without ever turning around. Solinus and Isidore added the detail that fixed the image for good: the creature does not slither in the usual sinuous line but rolls along in a loop, both heads straining outward at once, the body curved between them like a hoop set rolling across the stones.

It liked the cold, which set it apart from every other snake. Pliny noted that the amphisbaena alone stood up to the chill, and that it was the first serpent of the year to appear, out on the ground before the cuckoo had even begun to call. There is a quiet picture in that. On a raw morning in early spring, when the desert nights still bite and no other snake has stirred from its hole, the two-headed thing is already awake and moving over the cold sand.

Because it shrugged off cold, people decided its body could pass that virtue on. Pliny recorded the recipes. A pregnant woman might wear a live amphisbaena around her neck for a safe delivery; the skin by itself was good against aching joints and the common chill. A dead one worn as an amulet kept off feverish shivers, and if you fastened the carcass to a tree you meant to cut down, the woodcutters would feel no cold and the felling would go more easily. Aelian threw in another use: wrap the creature’s shed skin around a walking stick and it would drive off every snake you met on the road. The animal that frightened travelers was, dead and dried, a charm against the very things it belonged to.

Its fullest hour comes in Lucan’s account of the Roman civil war, where Cato leads his legionaries across the Libyan waste and the desert becomes a catalogue of horrible deaths. The serpents rise out of the ground one after another, each killing in its own particular way, and the amphisbaena is named among them, turning toward its two heads. Nonnus put it to gentler use. Describing the cursed golden necklace of Harmonia, he compared the jewel to a two-headed amphisbaena, its coils meeting at the wearer’s breast, its pair of curving necks worked in gold with a golden eagle poised above the gap between the heads. The eagle has the serpent in its grip. Even a snake that cannot be flanked can be carried off from above.

The medieval writers kept it alive for another thousand years, copying Isidore and Pliny from one bestiary into the next and adding a moral. A creature pulled toward two opposite ends became a tidy emblem for the double-minded man, the one who promises his maturity to wisdom while spending his youth on pleasure. Alexander Neckam preached a small sermon on exactly that. Then Albertus Magnus, reading the same texts in the thirteenth century, lost patience. No animal has two heads by nature, he wrote. The thing people called two-headed was simply a small snake whose two ends were the same size and thickness, able to lunge backward as well as forward because its ribs flexed both ways, and the famous second head was an illusion. He was right.

For all the double menace, the powers follow from a single odd fact of the body. Two mouths meant two sources of venom, and writers liked to say it was as if one was not enough. Two heads meant no blind side, no safe angle of approach, and the ability to flee in whichever direction the threat was not. The cold-hardiness gave it the early spring to itself and gave its corpse a reputation as a charm. The weaknesses follow just as plainly. It was small, and its bite, agonizing as the accounts make it, was still the bite of a small snake. A body hauled toward both ends at once does not move efficiently, which is why it had to roll rather than glide. And the marvel that made it feared made it valuable, so people hunted it for its skin. In the end the sharpest readers decided its great distinguishing feature was no feature at all, and the amphisbaena went on being drawn in the margins anyway, two-headed as ever.

Frequently Asked Questions

What is the Amphisbaena?

The Amphisbaena is a serpent from Greek and Roman legend with a head at both ends of its body. Its name means “goes both ways,” and it could crawl in either direction and bite with either mouth. Classical writers placed it among the venomous snakes of the Libyan desert.

How was the Amphisbaena born?

According to the Roman poet Lucan, the Amphisbaena was spawned from drops of blood that fell from Medusa’s severed head as Perseus carried it across the Libyan desert. This is the most famous origin story, though earlier Greek writers like Nicander and Aeschylus simply described it as a Libyan serpent without giving it that birth.

How does the Amphisbaena move with two heads?

The Amphisbaena moves by letting one head lead while the other trails behind as a tail, and it can reverse direction by switching the roles of its two heads without turning around. Later writers described it rolling along in a loop, its body curved like a hoop with both heads straining outward at once.

Is the Amphisbaena venomous?

Yes. The Amphisbaena was believed to carry venom in both of its mouths, and writers like Pliny remarked that it was as if a single poisonous mouth were not enough for it. Despite this, it was a small snake, and its agonizing bite was still the bite of a small animal.

Why did people wear the Amphisbaena as an amulet?

Because the Amphisbaena was thought to thrive in cold that killed other snakes, people believed its body could ward off chills and fevers. Pliny recorded that pregnant women wore a live one around the neck for a safe delivery, that its dried skin guarded against aching joints, and that fastening its carcass to a tree being felled kept the woodcutters warm.