Sif

Goddess of corn and fertility(?). She was a goddess with beautiful golden hair. Not much is known about Sif. Sif was possibly a Vanir goddess originally, like the goddess Freyja.

Sif was the wife and consort of Thor. She had a son named Ull.

Originally, Sif was probably a prophetess known as the Sibyl, which Snorri Sturluson mentioned in the prologue of the Prose Edda. This Sibyl married Tror (Thor), who she had met in the realm of Thrace, which Sturluson called Thrudheim. If this is truly the case, then she became the goddess of prophecy and divination, though in the usual Norse mythology, she doesn't appear to have had any gift with divination.

One story told about her tells how Loki had cut off her hair as a practical joke. In a rage, Thor would have bashed Loki to death, if the trickster did not restore Sif's hair.

Loki went to the dwarves, the sons of Ivaldi. The dwarves made a wig with hair made of finely spun gold. The magic in the wig allowed the gold to grow like natural hair. The gift was only one of several that the dwarves had made for the gods.

See Gifts of the Dwarves for the full story.