Then came Sif forward and poured mead for Loki in a crystal cup. She said: "Hail to thee Loki! To thy lips now raise this beaker full of good beer, so that me alone among the gods without a blot thou let'st be." He took the goblet and drank of it (and said): "That one thou wert, if thou wert indeed shy and didst shrink from men; but one I wot, whom well I know made a whore of Hlorrithi's (Thor's) wife: sly Loki, Laufey's son. - Lokasenna (Poetic Edda, Hollander translation). The Ferryman said: "With Sif someone sleeps in her bower; they strength thou should'st stake against his!" Thor said: "With wicked words sayst thou what worse would seem to me; but, craven knave, I know that thou liest." - Harbarzljodh (Poetic Edda, Hollander translation)
"Ull is the name of one, son of Sif and step-son of Thor". (Prose Edda, Anthony Faulkes translation, page 25). "How shall Thor be referred to? By calling him... husband of Sif". (p.77) "How shall Loki be referred to? By calling him... Sif's hair farmer". (p. 77) "How shall Sif be referred to? By calling her wife of Thor, mother of Ull, the fair-haired deity, rival of Iarnsaxa, mother of Thrud". (p. 86) "How shall gold be referred to? By calling it... Sif's hair". (p. 94) "Why is gold called Sif's hair? Loki Laufeyson had done this for love of mischief: he had cut off all Sif's hair. And when Thor found out, he caught Loki and was going to break every one of his bones until he swore that he would get the black-elves to make Sif a head of hair out of gold that would grow like any other hair. After this Loki when to some dwarves called Ivaldi's sons, and they made a head of hair and Skidbladnir and the spear belonging to Odin called Gungnir... The hair was rooted in the flesh as soon as it came on to Sif's head..." (p. 96 - 97)
Excerpt taken from Our Troth, Chapter XIII.
In his Teutonic Mythology (Volume 1), Jacob Grimm tells us that there is an herb (polytrichum aureum), that bears the name "haddr Sifjar" (Sif's hair). "Sifjar haddr" is the kenning for gold in Skaldskaparmal.
Many scholars claim that Sif is associated with grain. Her hair represents the waving, golden wheat and the story about her haircut is a metaphor for the harvest. She is married to Thor, God of Thunder, because he is associated with the summer rain and because according to Anglo-Saxon folklore, thunder caused the grain to ripen.
This doesn't, however, fit in that well with the stories we *do* have about Sif. Why would Thor get so upset about the harvest? Isn't that a *good* thing? And if she is all about cereal, why do all the other references to her have to do with whether or not she is a faithful wife?
Let's put scholarly speculation about grain aside for a moment and look at what we do have about Sif:
Her name means "relation" or "family member". She is the mother of Ullr, who is Thor's stepson and who is specifically remarked to be especially good at single combat.
In the _Lay of Harbard_, Odin insults Thor by claiming that Sif has a lover; he also mentions giving Thor an arm-ring as a settlement for some kind of seduction in Asgard. In _Lokasenna_, Loki claims that he had been Sif's lover. In the Prose Edda, Snorre tells the story of Hrungnir, a giant who showed up at Asgard and (after he got drunk) threatened to tear the place up and take Sif home with him. Thor takes exception; Hrungnir, a famous fighter, challenges Thor to single combat and loses fatally.
The most famous story that refers to Sif is really about Loki. In the Prose Edda, Snorre tells of the time Loki "for a joke" cut off all of Sif's hair. Thor is enraged and threaten to kill Loki unless he comes up with a magical replacement, Loki heads off to the dwarves, and returns with all of the gods greatest treasure-tools. Odin gets a spear and gold-making ring; Frey, a ship and golden boar; And Thor, a hammer and Sif's new hair. The gods handle the hair incident as a personal offense to Thor.
What speculation naturally grows out of this lore? Some wonder if Hrungnir was Sif's first husband or lover and the father of Ullr (since our predecessors commonly believed that things like skill in single combat would pass down through family lines). Others wonder how Sif's hair parallels the other magical treasures. Does it represent wealth or power? And what does Sif have in common with her husband? Are their spheres of interest and activity related? And just how did Loki get access to Sif's hair anyway?
I think that Sif should be associated with something that comprised all these things and others to our predecessors: the solidarity of the family. We read in saga after saga that a gracious, faithful, and sensible wife is the keystone of a successful family and that the family is critical to wealth, power, and security. Sif is certainly described in terms consistent with those admirable qualities, and she is the (only) Asgardian that most resembles Mother in the _Lay of Rig_. (In my opinion, Frigga is more interested in the business side of the family concern, and in politics.)
And to me, this role for Sif fits better with Thor's role as protector of the common man than a job as grain goddess. The common men *needed* their families for survival. They absolutely relied on them. The breakdown of family solidarity is the first sign of the coming of Ragnarok. That is why suggestions that Sif is unfaithful are so significant (and why discussions of faithfulness are just about the only time her name comes up).
Of course, none of the gods or goddesses is simply the "god of X". There is no reason that a role as glue of the family precludes an interest in grain. But I don't think there is any reason to believe is her main association.
- Manny Olds