Iðunn, wife of the poetry-god Bragi, guards the apples that the gods must eat to stay young — making her quiet orchard-keeping the load-bearing pillar of the pantheon's immortality.
Her great myth is her kidnapping. Coerced by the eagle-giant Þjazi, Loki lured Iðunn out of Asgard with talk of finer apples, and Þjazi snatched her away to Þrymheimr. The gods, greying and withering, discovered Loki's part and set him to fix it: borrowing Freyja's falcon cloak, he flew to Jötunheimr, turned Iðunn into a nut, and carried her home with Þjazi's eagle-form burning behind him in a fire the gods kindled at Asgard's wall. Þjazi's death brought his daughter Skaði to Asgard demanding compensation — and so one myth seeds the next.
The goddess the gods cannot live without
The Norse gods are not immortal. It is one of the mythology's quietest and most consequential facts: the Æsir age like everyone else, and what holds age at bay is a basket of apples in the keeping of one unassuming goddess. Snorri, in Gylfaginning, states the arrangement plainly — Iðunn guards in her ash-wood box the apples the gods must bite when they begin to grow old, and so they will endure until Ragnarök. The skalds called the fruit ellilyf ása, "the gods' remedy against old age." Every feast in Valhalla, every duel and quest and scheme in the mythology, runs on Iðunn's fruit; she is the pantheon's supply line, and her single myth is the story of what happens when the supply line is cut.
Her name is usually read as "the ever-young" or "the rejuvenating one" — from ið-, "again, anew" — the keeper named for what she keeps. She is married to Bragi, the god of poetry, a pairing the skalds savoured: verse and vitality, the two things that outlast a mortal lifetime, keeping house together.
The kidnapping of Iðunn
The full story comes in Skáldskaparmál, and it begins — as the gods' disasters usually do — with Loki in trouble. Three gods, Odin, Hœnir, and Loki, travelling through the mountains, slaughter an ox that mysteriously will not cook. An enormous eagle in the tree above confesses himself the cause and demands a share; when he takes too much, Loki drives a pole into him, and the eagle flies off with the pole and Loki attached, dragging him over rocks and trees until his arms are nearly out of their sockets. The eagle is the giant Þjazi in his feather-shape, and his price for landing is an oath: Loki must deliver Iðunn and her apples out of Asgard.
Loki pays it with typical craft, telling Iðunn he has found apples in a wood outside the walls that she will think very fine — bring yours, come compare. She walks out with her box; Þjazi drops from the sky in eagle-shape and carries her to Þrymheimr, his hall in the high mountains.
Then comes the passage that gives the whole mythology its stakes: deprived of the apples, the gods grow old and grey. Snorri's phrase is quietly terrible — the Æsir became hárir ok gamlir, hoary and old — the deathless suddenly watching their own hands wrinkle. The last time anyone saw Iðunn, they establish at assembly, she was walking out of Asgard with Loki. Seized and threatened with death, Loki agrees to fetch her back if Freyja lends him her falcon-shape, the feather cloak Valshamr. He flies to Jötunheimr, finds Iðunn home alone while Þjazi rows on the sea, transforms her into a nut, and beats back toward Asgard with the nut in his claws — and Þjazi behind him in eagle-shape, the wingbeats gaining.
The gods, watching the tiny falcon and the vast eagle closing on it, stack plane-shavings inside the wall. The falcon clears the rampart and drops; the gods fire the shavings; the eagle, unable to bank, flies straight into the flame, and the gods kill Þjazi inside the gate. Snorri adds that this slaying is "greatly renowned" — and the ninth-century skaldic poem Haustlöng, by Þjóðólfr of Hvinir, confirms it, painting the chase on a decorated shield generations before Snorri wrote. The aftermath belongs to Skaði, Þjazi's daughter, who arrives armed and grieving, and whose compensation — a husband chosen by his feet, a laugh forced from her by Loki's most ridiculous stunt — begins the next tale.
Is Iðunn's fruit really apples?
Probably — with an asterisk scholars enjoy. Old Norse epli, like its cognates, could mean apples specifically or tree-fruit generally, and cultivated apples were a latecomer to Scandinavia; some have argued the original fruit of youth was something older and vaguer, sharpened into "apples" by medieval usage. Fruit and nuts as grave-goods go deep into Germanic antiquity, and the parallel with other Indo-European traditions — the golden apples of the Hesperides, the apples of eternal life in Irish myth — suggests the motif itself is ancient, whatever grew on the first tree. That Iðunn crosses the sky as a nut in Loki's claws only adds to the sense of very old fertility imagery underneath Snorri's tidy narrative.
Beyond her great myth, Iðunn appears at the feast in Lokasenna, where she restrains her husband Bragi and is repaid with Loki's sneer that she once embraced her brother's slayer — an allusion to a story now entirely lost, one of several hints that Iðunn once had more mythology than survives. The prose header calls her the most protective of women; her recorded actions bear it out.
In the primary sources
Skáldskaparmál in the Prose Edda carries the abduction in full, and Gylfaginning explains the apples' function; the skaldic poem Haustlöng, quoted by Snorri, attests the story a good three centuries earlier. In the Poetic Edda she appears in Lokasenna, and the prose of the poem Hrafnagaldur Óðins — a late, puzzling piece not always counted canonical — shows her fallen from Yggdrasil into the dark below, wrapped in a wolfskin, weeping. She has left no known place-names or cult traces: a goddess of story rather than sacrifice.
Legacy
Iðunn's apples became one of the most borrowed images in Norse myth — shorthand everywhere for youth held in trust and the fragility of golden ages. Idun lent her name to a landmark Norwegian women's magazine, to companies and cultivars across Scandinavia, and to a moon-crater on Venus; Richard Wagner reworked her, as Freia with the golden apples, into the hostage-plot of Das Rheingold. The quiet keeper of the orchard endures as the mythology's gentlest lesson: entire worlds rest on the person everyone forgets to guard.
Frequently asked questions
What do Iðunn's apples do?
They restore youth. Snorri says the gods must eat them when they begin to age, and that by them they will stay young until Ragnarök. When the giant Þjazi stole Iðunn away, the gods immediately began to grow old and grey — proof of how completely their vitality depends on her.
Who kidnapped Iðunn?
The giant Þjazi, in eagle form — but the inside man was Loki, who owed Þjazi an oath after being captured by him, and who lured Iðunn outside Asgard's walls with talk of finer apples. Forced by the aging gods, Loki then rescued her in Freyja's falcon cloak, carrying her home transformed into a nut.
Who is Iðunn's husband?
Bragi, the god of poetry and eloquence. The Eddas make them a settled couple — at Ægir's feast in Lokasenna she calms Bragi and tries to keep the peace — and poets liked the symbolism of verse married to everlasting youth.
Is Iðunn a major goddess?
Her surviving mythology is small — essentially one great story — but her function is enormous: without her apples the gods age and fail. Stray references, like Loki's taunt about her brother's slayer, hint at lost myths, and scholars suspect she was once a fuller figure than the texts preserve.