Seps

A Roman soldier called Sabellus felt something close on his shin, a weight no greater than a bootlace, and reached down and tore it off. He drove his javelin through it and pinned it to the sand. For the length of a breath, that was the end of the incident.

Then the wound opened outward. The flesh around the puncture went first, thinning and running until the bone stood pale and bare in the middle of his leg. His calves and knees wasted. His thighs thawed into a black liquid. The membrane that held his organs in place came apart and let them out onto the ground, the ligaments binding his muscles were drawn down into juice, and the frame of his chest stood empty and open with everything that had made him a man gone from inside it. His neck and shoulders and arms went last. Lucan, who wrote all of this down in the ninth book of his poem on the civil war, reached for two comparisons and rejected both. Wax does not go that fast under the sun. Snow does not go that fast in a south wind. Then he made the point that mattered to him: fire burns a body and leaves the bones, and the seps left nothing. The other snakes of Africa took a man’s life. This one took the life and the clay it came in.

The march was Cato’s. The younger Cato led the remnant of the republican army out of the Syrtes and across the Libyan desert on foot, and Lucan gave most of a book to what the desert did to them. Thirst first, then the snakes. The soldiers die one at a time, each to a different venom, which is the poet’s method for anatomising a country that kills in specialised ways. Sabellus draws the seps.

The animal responsible was small enough to hold in one hand, and every writer who mentions it says so before saying anything else. Isidore of Seville gave it a single line in the Etymologies: a small snake that consumes not only the body but also the bones with its venom. Solinus was shorter still. The sting of the seps is followed by putrefaction. Gerald of Wales called it a little reptile whose malignity makes up for its diminutive size. The name is the whole diagnosis, taken from the Greek verb for rotting.

Aelian is the one who looked at it properly. He describes a snake that changes the colour of its body to match the places it passes through, and four hollow fangs set in the lower jaw, each capped by a membrane like a small veil that hides the opening. When it strikes, the veils lift and the venom runs down the ducts, and the wound festers almost at once. Nicander, writing earlier, agrees about the colour: its hue is never one hue, and it takes the shade of whatever place it has made its hole in. He also drops the detail that undoes most attempts to identify it. Avoid the seps, he says, which resembles the squat lizards. Short, thick, low to the ground, built more like a skink than a viper, and the exact colour of the stone it lies against. No modern species answers to that with any confidence, and the ancient venom catalogues were never written to be identification keys.

On the flank of Mount Othrys, in a gully of loose stone and dead thorn, it spent its life not being seen. The rock held the day’s heat well into the evening. A goat came down through the scree, close enough to send grit sliding, and passed on, and nothing in the gully moved.

Where it came from depends on who is telling it. Lucan gives Libya an origin story for all of its serpents at once. Perseus, flying home with the Gorgon’s head, was steered south by Athena over the emptiest country she could find, so that nobody below would look up and be turned to stone. Blood ran from the severed neck and fell on the sand, and the sand bred snakes: the asp, the cerastes, the amphisbaena, the jaculus, the dipsas, the prester, the basilisk and the seps. Nicander had already put the same creature in the crags of Thessaly with no origin at all, which is the more ordinary arrangement. A poet who needed the snakes of Africa to mean something invented a father for them. A poet cataloguing venoms only needed them to exist.

Isidore’s line carried the seps into the Middle Ages, and the Middle Ages kept it almost word for word. Thomas of Cantimpré wrote it as serps, small in body but enormous and evil in its malice, consuming flesh and bone together as though the victim had been seized by voracious flames. Jacques de Vitry set it down in an account of the Holy Land: the seps is small, but its venom inflames flesh and bones. Bartholomaeus Anglicus turned it into Ceps, an adder that slays a man and drives him mad, and quoted Lucan’s Latin outright, ossaque dissolvens cum corpore tabificus Seps. Nobody added anything for eight hundred years. The creature had one property, the property was unforgettable, and there was nothing in it to improve.

Everything it can do is in the venom. It has no size, no coils worth the name, no speed anyone thought to remark on, no gaze, no breath, no cunning. What it has is a bite that kills quickly and then keeps working after the killing is done, and the concealment that lets it be stepped on. Lucan’s soldier never saw it, which is the whole method. The colour-matching is not display. It is the reason the animal gets close enough to matter.

The limits are as plain as the power. Sabellus pulled it off his leg with his bare hand and killed it with a single thrust, and it died like any small snake pinned to hot ground. It cannot pursue. It has to be trodden on, brushed against, or lain down beside. And Libya held a counter to it, or at least to its relatives: Lucan brings on the Psylli, a desert people said to be immune to venom, who drew the poison out of blackened flesh by singing over the wound and, when singing was not enough, set their lips to it, sucked the death out of the man and spat it on the ground. Cato’s column marched on lighter for their help. They came too late for Sabellus, and there was nothing left of him to carry.

Frequently Asked Questions

What is the seps?

The seps is a very small venomous snake of Greek and Roman legend whose bite dissolved flesh, sinew and bone together. It appears in Nicander’s Theriaca, in Aelian’s On the Characteristics of Animals and, most famously, in the ninth book of Lucan’s Pharsalia. Medieval writers from Isidore of Seville onward repeated its one defining property almost unchanged for centuries.

What does seps venom do to a person?

Seps venom destroyed the entire body rather than merely killing it. In Lucan’s account the soldier Sabellus is bitten on the shin, and his flesh, ligaments and organs run away into liquid before his bones dissolve too, faster than wax melts under the sun. Lucan’s closing point is that even a funeral pyre leaves bones behind, and the seps left nothing.

What did the seps look like?

Ancient writers describe the seps as tiny and able to change the colour of its body to match the ground it crosses. Aelian adds four hollow fangs in the lower jaw, each hidden beneath a thin membrane that lifts when the snake strikes. Nicander likens it to a squat lizard rather than a snake, and no modern species can be matched to these descriptions with confidence.

Where did the seps come from?

Lucan explains the snakes of Libya, the seps among them, as the offspring of Medusa’s blood. Perseus flew home over the empty desert carrying the Gorgon’s severed head, and where the blood fell on the sand it bred serpents. Nicander, writing earlier, places the seps in the rocky gullies of Mount Othrys in Greece and gives it no origin story at all.

Could a seps bite be cured?

Lucan describes no cure for Sabellus, who died within moments of being bitten. The poem does credit the Psylli, a Libyan people believed immune to venom, with treating snakebite in Cato’s army by chanting over the wound and sucking the poison out of it. They reached the rest of the column, but they came too late for Sabellus.

Related Entries

Cerastes, Jaculus, Amphisbaena, Basilisk, Catoblepas, Medusa, Gorgon, Perseus, Chrysaor, Pegasus, Leucrota, Salamander, Hydrus, Cockatrice