Sif: The Goddess Whose Stolen Hair Gave Thor His Hammer
Sif is the golden-haired goddess married to Thor in Norse mythology. Her one full myth survives in Skáldskaparmál, part of Snorri Sturluson's Prose Edda: Loki cut off her hair, and to escape Thor's anger he had dwarfs forge replacement hair from real gold. That cover-up accidentally produced Mjölnir, Thor's hammer.
Sif gets a strange deal in the sources. She is married to the most popular god in the pantheon, her hair sets off the most consequential crafting story in Norse myth, and yet she almost never speaks. This post walks through the prank, the forge, and every single passage that mentions her, without padding that pretends we know more than we do.
The Prank: Why Did Loki Cut Off Sif's Hair?
Skáldskaparmál (chapter 35 in the common numbering) opens the story bluntly: Loki Laufeyjarson, out of pure mischief, cut off all of Sif's hair. No motive is given. When Thor found out, he caught Loki and was ready to break every bone in his body until Loki swore to fix what he had done. The promise was specific: he would get the black-elves, the dwarfs, to make Sif a head of hair from gold that would grow like living hair.
Readers have hunted for a motive for centuries. In Lokasenna 54, Loki boasts to Sif's face that he was her lover, and in Hárbarðsljóð 48 a disguised Odin needles Thor with the claim that Sif has a lover at home. Some scholars read the haircut as an adultery accusation acted out: a married woman's shorn hair as public shame. Maybe so. The texts hint at it twice and confirm it nowhere, and we will not pretend otherwise.
Dwarf Gold: How Sif's New Hair Led to Mjölnir
Loki went below to the dwarfs called the sons of Ívaldi, and they delivered beyond the brief: the golden hair, plus the folding ship Skíðblaðnir and the spear Gungnir. Then Loki, unable to quit while ahead, bet his own head against a dwarf named Brokkr that Brokkr's brother Sindri (called Eitri in some editions) could not forge three treasures as good.
Sindri could. While a stinging fly bit at Brokkr's hand, then his neck, then his eyelid as he worked the bellows, the brothers produced the golden boar Gullinbursti, the self-multiplying ring Draupnir, and Mjölnir. The third bite drew blood into Brokkr's eyes and the bellows sagged for a moment, which is why the hammer came out with its one famous flaw, a handle slightly too short. Snorri never says who the fly was. Loki had a head to lose and a talent for changing shape, so readers have drawn the obvious conclusion for centuries. The gods judged the hammer the best treasure of all six, since it promised the greatest defense against the frost-giants. Loki still tried to run for it, in shoes that carried him through air and over water, and Thor had to catch him and hand him back. Then came the technicality: the wager covered Loki's head but not his neck, so no cut could be made. Brokkr settled for sewing Loki's lips shut with a thong the text names Vartari.
The hair itself came with a warranty. When Loki presented the gifts, he told the gods the gold would grow to Sif's flesh the moment it came upon her head, living hair in every way but origin. Skaldic poetry ran with it: in the kennings, gold is simply "Sif's hair." Every time a poet called treasure by that name, he was retelling this story in two words.
Sif in the Sources: Every Passage That Mentions Her
The honest list is short, which is itself worth knowing.
- Skáldskaparmál: the hair story above, plus the official list of ways to refer to Sif: wife of Thor, mother of Ullr, mother of Þrúðr, the fair-haired goddess, rival of the giantess Járnsaxa. And gold as "Sif's hair."
- Gylfaginning 31: Ullr is the son of Sif and the stepson of Thor, a bowman and skier so good that nobody can compete with him. Ullr's father is never named anywhere in the surviving sources.
- Lokasenna, prose frame and stanzas 53-54: at Ægir's feast, Sif steps forward, pours mead for Loki, and calls herself blameless among the gods. Loki answers that she was his lover. Nobody in the poem resolves it.
- Hárbarðsljóð 48: the ferryman Harbard, Odin in disguise, taunts Thor that Sif has a lover at home and that Thor should hurry back to deal with him.
- Þrymskviða 24 and Hymiskviða 15 and 34: Thor appears under the kenning "Sifjar verr," Sif's husband. She is not present in either poem; her name is simply how the poets point at him.
- Prose Edda, Prologue: in Snorri's euhemerized frame story, Thor's wife Sif is identified with a prophetess called Síbil. Snorri admits he cannot tell her lineage, saying only that she was fairest of all women and that her hair was like gold.
You can check every passage yourself in the Prose Edda, Brodeur translation and Lokasenna in Bellows' Poetic Edda. That is the entire dossier: no dedicated poem, no temple record, no surviving carving identified as Sif with any confidence.
Her Name, and the Wheat Theory
The name Sif is the singular of Old Norse sifjar, "kinship by marriage," cognate with English "sibling." Her name literally means something like "in-law bond" or "marriage relation." For a goddess defined almost entirely by her marriage, the fit is neat, and it may point to an older role as a guardian of wedlock. That last step is inference, so treat it as inference.
Then there is the famous wheat theory. Golden hair that is cut and then grows back reads like a grain field ripening after harvest, so scholars from the nineteenth century onward proposed Sif as a harvest or fertility goddess. It is an attractive idea. It is also nowhere in the sources. No Norse text connects Sif to grain, fields, or fertility of the land. When a website calls her "goddess of the harvest" as settled fact, you are reading interpretation dressed up as attestation.
Golden Hair, Modern Metal
Sif's story translates into jewelry more naturally than most myths, because the myth is literally about wearable gold that becomes part of the person. Gold-toned pendants, braided chains that echo plaited hair, and hammer motifs all sit close to her story; remember that the hair and Mjölnir came out of the same wager, forged in the same workshops. Anyone wearing gold-toned Norse pieces is carrying the old kenning around their neck, whether they know it or not: to the skalds, gold simply was Sif's hair.
FAQ: Sif
Who is Sif in Norse mythology?
Sif is a goddess of the Æsir, wife of Thor and mother of Ullr, famous for her golden hair. She appears in Snorri's Prose Edda and briefly in the poems Lokasenna and Hárbarðsljóð. Beyond the story of her hair, the surviving sources record very little about her.
Why did Loki cut off Sif's hair?
Skáldskaparmál gives no motive beyond mischief. Loki simply did it, and Thor's threats forced him to replace the hair with dwarf-forged gold. Because Loki boasts in Lokasenna 54 that he was Sif's lover, some scholars read the haircut as an adultery motif, but no text says so directly.
Who are Sif's children?
Two are named. Ullr, the ski and bow god, is her son by an unnamed father, which makes him Thor's stepson (Gylfaginning 31). Þrúðr (Thrud) is named in Skáldskaparmál's kennings, which call Sif her mother and Thor her father. No other children of Sif appear in the sources.
Is Sif a goddess of wheat or the harvest?
Not in any surviving text. The harvest reading is a scholarly interpretation from the nineteenth century, built on the image of golden hair that is cut and grows back like grain. It may be right, but it remains a theory. The Eddas only call her Thor's fair-haired wife.
What does the name Sif mean?
Sif is the singular of Old Norse sifjar, a word for kinship created by marriage, related to English sibling. Her name essentially means marriage bond or in-law relation. Scholars take it as a hint that she may once have guarded oaths of wedlock, but that is inference from etymology, not something any surviving text states.
Sources
- Snorri Sturluson, Prose Edda: Prologue, Gylfaginning 31, Skáldskaparmál ch. 35 and the Sif kennings. Brodeur translation.
- Poetic Edda: Lokasenna 53-54, Hárbarðsljóð 48. Bellows translation of Lokasenna.
Keep exploring: her husband gets the full treatment in Thor in Norse mythology, our guide to the Norse gods and goddesses puts the whole family in order, historical Viking hairstyles covers what real Norse hair looked like, Norse goddess names rounds up Sif's peers, and our gold-toned Viking necklaces carry the story in metal.