Take Iðunn out of Ásgarðr and the gods start going grey within days.
That is the premise of the only substantial myth she has, and it does something no other Norse story does: it makes the immortality of the gods conditional and maintained, a supply problem rather than a property. The Æsir are not deathless. They are on a regimen, and one woman with a box is the entire logistics chain.
The abduction, as Haustlöng tells it
The earliest version is not Snorri's. Haustlöng is a skaldic poem by Þjóðólfr of Hvinir, probably from around 900, describing pictures painted on a shield — which means the story was fixed enough to be depicted and alluded to a full three centuries before the Prose Edda.
Odin, Hœnir and Loki are travelling and stop to cook an ox in an earth oven. The meat will not cook. An eagle in the tree above admits to preventing it and offers a bargain: let him eat his fill first. He takes so much that Loki, enraged, strikes at him with a pole — and finds his hands stuck to one end while the eagle rises with the other. Dragged over stones and through thickets with his arms nearly torn out, Loki agrees to the eagle's price. The eagle is the giant Þjazi.
The price is Iðunn and her apples. Loki lures her out of Ásgarðr by telling her he has found apples she will think worth comparing with her own, and to bring hers along for the comparison. Þjazi carries her to Þrymheimr.
Snorri then supplies the consequence in one of his best sentences: the Æsir became grey-haired and old. They convene, establish that Loki was last seen with her, threaten him with death, and he agrees to fetch her back — borrowing Freyja's falcon shape, turning Iðunn into a nut, and flying for Ásgarðr with the eagle behind him. The gods pile wood-shavings on the wall; Loki clears it; Þjazi cannot stop and his feathers catch. He is killed inside the wall, which is what brings his daughter Skaði to Ásgarðr in armour demanding compensation.
The whole sequence of Skaði's marriage, Loki and the goat, and Þjazi's eyes in the sky proceeds from this theft.
The apples that may not be apples
Old Norse epli is not a precise botanical term. Like Latin pomum and Old English æppel, it covered fruit and nuts broadly, and could be qualified — jarðepli, earth-apple, for a root vegetable — in the same way that "pineapple" and "love apple" once worked in English. Apples in the modern cultivated sense were not a significant Scandinavian crop in the Viking Age.
So "apples of immortality" is a translation choice, and a loaded one, because the golden-apple motif is enormously familiar from Greek material — the garden of the Hesperides, the apple of discord — and from later fairy tale. The Oseberg ship burial from 834 did contain a bucket of wild apples, which is genuine and often cited, though what it was for is anyone's guess.
There is also a text-critical wrinkle: some scholars have argued that the word in the earliest tradition may have referred to the fruit as a symbol of renewal generally rather than a specific species, and Snorri is the one who fixes the image. The name Iðunn itself is usually parsed as containing ið-, "again," giving something like "the rejuvenating one" — the fruit and the goddess may be the same idea twice.
Where else she appears
- Lokasenna: she tries to calm Bragi, her husband, when Loki provokes him, and asks him not to speak reproachful words to Loki's wolf-son. Loki's retort is that she is the most man-crazed of women and embraced her brother's slayer with washed arms. The brother is unattested elsewhere and the accusation is unexplained — another of the corpus's small craters.
- Skáldskaparmál: Snorri lists her kennings — keeper of the apples, wife of Bragi, the Æsir's maiden — and preserves Haustlöng.
- Hrafnagaldur Óðins: a poem in which she falls from the world tree into the depths and receives a wolfskin. This text is a post-medieval composition, probably seventeenth-century, and is not evidence for pre-Christian belief. It is often quoted online as though it were Eddic. It is not.
The gap where a cult should be
There are no Iðunn place-names, no personal names formed on hers, no archaeological trace. For a goddess who holds the pantheon's life-support she is remarkably absent from the ground, and the fair conclusion is that she is a poetic and narrative figure — the personification of a story-need — rather than someone anyone made offerings to.
Her modern afterlife is likewise slight: Idunn and Idun survive as rare Norwegian and Swedish given names, and she is the name of a long-running Swedish women's magazine and a Norwegian literary journal. She appears occasionally in fiction as an apple-carrier and almost never as anything else. Compare the density of evidence for Freyr or Thor, and see the tradition overview for how uneven the surviving record is.
If the gods need her apples, why does nobody guard her?
The story is structurally aware of this. Loki gets her out by appealing to expertise — he claims to have found comparable fruit and asks her to bring her own to judge — so the theft works precisely because she is the authority on the subject. Beyond that, Norse myth has no interest in the gods behaving prudently; almost every disaster in the corpus follows from an Ás accepting a bargain that anyone could see was a trap, and the narrative treats this as a fact about how the world runs rather than a character flaw.
Is Iðunn related to the Greek Hesperides or to Eve?
Nothing textual connects them, and the resemblance is at the level of motif — a woman, a garden or box, a fruit with power. Comparative mythologists have proposed a shared Indo-European rejuvenation-fruit; the counter-argument is that fruit is an obvious symbol of renewal and that medieval Icelandic writers had read enough Latin literature for the Hesperides to have coloured a retelling. What is genuinely distinctive in the Norse version is that the fruit is not forbidden, not stolen by mortals, and not moral in any way. It is a rationed supply, and the crisis is that it stopped arriving.