Sleipnir

Sleipnir ('Slipper' or 'Glider') is the finest of horses, grey and eight-legged, who carries Odin over sea and sky and down the long dark road to Hel. His origin is the myths' strangest: when a giant builder offered to wall Asgard in a single winter — with the sun, the moon, and Freyja as his price — it was his stallion Svaðilfari that made the work possible. To wreck the bargain on its last day, Loki became a mare and lured the stallion away; some months later Loki bore the foal.

Hermóðr rode Sleipnir on the failed embassy to ransom Baldr from Hel, leaping the gates of the dead. The horse's eight legs have been read many ways — the four pallbearers of a bier, the drumming gait of the shaman's journey — and he appears, eight-legged and unmistakable, on Gotland picture stones carved a thousand years ago.

The strangest birth in the myths

The full story of Sleipnir's begetting is told in Gylfaginning, and it begins with a construction contract. Early in the gods' history, a builder came to Asgard offering to raise a fortification around it in three seasons — proof against hill-giants and frost-giants — and named his fee: the goddess Freyja for his wife, plus the sun and the moon. On Loki's advice the gods agreed, with conditions meant to make the job impossible: one winter only, and no man's help. The builder asked leave to use his stallion, Svaðilfari, and Loki argued him that concession.

It was the stallion that nearly broke them. By night Svaðilfari hauled stones so enormous that the gods sat astonished; the horse did twice the work of the builder. Three days before summer, with only the gateway unfinished, the gods convened in something close to panic — who had advised marrying Freyja into Jötunheimr and hauling the sun and moon out of the sky? — and turned on Loki with a unanimous verdict and a death sentence unless he fixed it. That evening, as the builder drove out for stone, a mare ran from a wood and whinnied at the stallion. Svaðilfari snapped his traces and chased her all night, the builder chased his horse, and the work stood still. The deadline passed; the builder flew into a giant's rage; the gods called Thor, whose hammer settled the account with the builder's skull.

Loki, meanwhile, had been rather more thorough than the plan required. "Somewhat later," Snorri writes with magnificent restraint, Loki bore a foal — grey, with eight legs. "And that is the best horse among gods and men."

Where does Sleipnir carry Odin?

Sleipnir is not a battle-mount so much as a vehicle for crossing between states of the world — and above all, for reaching the dead. In the Eddic poem Baldrs draumar, when Baldr is troubled by ominous dreams, Odin saddles Sleipnir and rides down to Niflhel, past a blood-chested hound, to a völva's grave beyond the eastern gate, and raises her with spells to interrogate her about his son's fate. The road down to Hel is Sleipnir's road.

He makes the journey again, under another rider, in the mythology's saddest errand. After Baldr's death, his brother Hermóðr borrowed Odin's horse to ride to Hel and beg the goddess to release him. Nine nights Hermóðr rode through valleys so dark and deep he saw nothing, over the river Gjöll on its gold-thatched bridge — where the guardian Móðguðr marvelled that one living rider made more thunder than five battalions of the dead — and up to the barred gates of Hel itself. There Hermóðr dismounted, tightened the girth, remounted, and spurred: Sleipnir cleared the gate without so much as grazing it. It is the horse's signature feat, and it did what no argument could — got a living man inside the walls of death. The embassy itself failed, as everything about Baldr's story fails, but no blame attaches to the horse.

Sleipnir also races. In Skáldskaparmál, Odin rides him into Jötunheimr and wagers his head that no horse there is as good; the giant Hrungnir, mounted on Gullfaxi ("Gold-mane"), gallops after him in fury and is so carried away by the chase that he finds himself inside Asgard's gates — the beginning of the duel with Thor that ends with a whetstone in the sky and Hrungnir dead. Sleipnir wins the race; the giant loses everything else. And in Grímnismál's catalogue of bests, Odin himself declares the ranking: Yggdrasil is the best of trees, Skíðblaðnir the best of ships, Odin the best of the Æsir — and Sleipnir the best of horses.

Why does Sleipnir have eight legs?

The sources never say; they only insist on the number. Interpretation has filled the silence from two main directions. One reading looks to funerals: an old suggestion sees in the eight legs the four pallbearers who carry a bier — the "horse" on which every dead man rides to the grave, walking on eight human legs. Another looks to ecstatic religion: scholars have compared Sleipnir to the spirit-steeds of Eurasian shamanism, the mount on which the seer travels between worlds, his impossible gait the drumming that carries the trance. Both readings suit a horse whose special competence is the road to Hel and whose rider is the god of the hanged and the inspired; neither is provable from the texts. What the texts do support is simpler: eight legs mean unearthly speed and unearthly reach, over sea and air as well as land. Even Yggdrasil's name may keep the horse in view — it is usually read as "Yggr's steed," Odin's horse, a kenning for the gallows-tree the god rode when he hanged himself for the runes; the world-tree and the world-horse shadow one another.

In the primary sources

Sleipnir is attested across the whole span of the tradition. In the Poetic Edda: Grímnismál names him best of horses; Baldrs draumar opens with Odin saddling him for the ride to Niflhel; Sigrdrífumál lists Sleipnir's teeth among the surfaces on which runes were carved; Hyndluljóð remembers, in a catalogue of Loki's misdeeds, that Loki bore the foal to Svaðilfari. In the Prose Edda: Gylfaginning tells the wall-builder story and Hermóðr's Hel-ride, and Skáldskaparmál the race against Hrungnir, besides teaching poets the kennings. In the Völsunga saga, Sleipnir's line continues: the hero Sigurðr chooses his grey stallion Grani, of Sleipnir's stock, with the advice of an old man in the forest who is Odin unannounced. And on the island of Gotland, picture stones raised in the eighth century — Tjängvide and Ardre VIII are the famous ones — show a rider on an eight-legged horse being welcomed, most scholars think, into the world of the dead: Sleipnir carved by pagan hands centuries before any surviving manuscript.

Legacy

Sleipnir has ridden further than any other horse in mythology. Folklore in Scandinavia long pointed out hoof-shaped landmarks — the horseshoe-shaped canyon Ásbyrgi in Iceland is popularly called Sleipnir's hoofprint. In modern culture the eight-legged grey turns up wherever Odin does, from Marvel comics and novels to video games such as God of War and Assassin's Creed Valhalla, and he lends his name to ships, aircraft, and a good deal of Scandinavian industry. The picture the tradition keeps returning to is the one the Gotland carvers chose: not the battle, but the arrival — a grey horse with too many legs, landing lightly on the far side of a gate no one living should be able to cross.