Among the gods there was one who was really unfit to be a god and to live in the shining city of Asgard. He was the cause of much trouble and mischief in his frequent journeys to the earth, and he brought evil upon even the gods themselves. But as Loki was the brother of Odin, the leader of the gods and king of Asgard, he could not very well be banished from Asgard, so the gods endured his presence as best they could. Loki did many unkind things that the gods never heard of; but once he met with just punishment for his meanness. This was the time that he robbed Sif of her golden hair.

Sif was the wife of Thor, the god of thunder. She had beautiful long hair that fell over her shoulders like a shower of gold, and of this she was very proud. One day Sif fell asleep on the steps of Thor's palace, and while she lay there sleeping Loki came walking by. There was nothing so dear to Loki as a chance to do mischief, and he never saw anything beautiful without wishing to spoil it; so when he found Sif fast asleep, he stole up softly behind her and cut off all her golden hair.

When Sif woke at last and saw what had happened, she began to cry bitterly, for her golden hair was the pride and joy of Thor, and she was afraid that he would never want to look at her again now that it was gone. So she got up from the steps where she was sitting, and went away to hide in the garden. When Thor came home, he looked for her all through the palace, and went from room to room calling her name. Not finding her in the house, he went out into the garden, and after searching for a long time finally found poor Sif behind a stone, sobbing bitterly. When he heard her story, he tried to comfort her the best he could, but Sif continued weeping and covered her shorn head with her arms.

"I know who did this shameful thing," cried Thor, wrathfully; "it was that mischief-maker Loki, but this time he shall pay dearly for his wickedness." And he strode out of the palace with a look so threatening that even the gods might have trembled before him. Now Loki was not expecting to be caught so soon, and he had not thought of seeking a hiding place; so when Thor came suddenly upon him he was too frightened to try to escape. He even forgot his ready lies, and when Thor shook him angrily and threatened to kill him for his wicked act, he made no denial, only begged for mercy and promised to restore to Sif the hair he had cut off. Thor therefore released him, after binding him by a solemn oath to fulfil his promise.

The real hair which Loki had cut off he had already lost, so to keep his word to Thor he must find something else which would resemble it closely enough to make Sif believe she had indeed her own hair again. As there was only one place where skilful and cunning work like this could be done, Loki crossed the rainbow bridge that spans the gulf between Asgard and the earth, and hurried to the tall mountain which hides, amid its rocks, the entrance to the lower world. No one but a god, or one of the swarthy elves themselves, could have found this hidden opening, but Loki knew it well. He first looked for a tiny stream which flowed along at the foot of the mountain. This he followed to its source in a deep cave among the rocks, and when he came to the spot where it bubbled up from the ground, he raised a huge log that was lying, apparently by chance, close beside it. This disclosed a small passage leading down into the very centre of the earth, and along this path Loki hastened, often stumbling about in the darkness, until he came to the underworld where lived the swarthy elves. They were busily engaged in their wonderful workshop, which was lighted only by the fires from the forge, but when they saw Loki they laid down their tools and asked him how they could serve him.

"I have a task," answered Loki, "which requires such great skill to perform that I hardly dare ask you to attempt it. It is nothing less than for you to make of your gold some locks of hair that will be as soft and fine and beautiful as the golden hair which adorns the head of Sif, the wife of Thor. You have heard, no doubt, of its beauty, so you know how difficult a task I have given you."

The elves, nothing daunted, set at once to work, and selecting a bar of perfect gold, they pounded it very soft, then spun it into threads so fine that they looked like sunbeams, and so soft that they felt like silk. When the work was finished and placed in Loki's hand, it exceeded in beauty anything he had ever seen, and he felt sure that Thor could not complain of his gift. Then he thanked the swarthy elves and hastened with his prize back to Asgard and to the palace of Thor, where all the gods had assembled to see the fulfilment of Loki's promise.

In spite of the success of his undertaking, the fear of Thor's hasty temper kept Loki somewhat humbled, for the Thunderer had been known to crush the object of his anger with his hammer when once his wrath was fully roused. His face was now dark and threatening as Loki approached, and beside him stood Sif, weeping bitterly, and trying to cover her head with her hands. But Loki came up boldly and placed the golden hair which the elves had made, upon her head. To the astonishment of all, it immediately grew fast, and no one could have told that it was not her own golden hair. So Sif was proud and happy once again, and Loki was forgiven.