Signy, in Norse mythology, only daughter of the hero Volsung and Ljod. Signy was the wife of the ruthless King Siggeir. She had ten brothers, including Sigmund, the youngest. Their story is told in the Scandinavian epic 'Volsunga Saga'. Signy was married against her will to Siggeir, king of the Goths. At the wedding, Odin himself came as a guest, disguised as a one-eyed man. He thrust a sword called Balmung into the Branstock oak, saying that the weapon would belong to the man who could pull it out of the tree, and that it would give victory in any fight. Volsung, out of courtesy, invited the bridegroom to try first, but Siggeir could not loose the sword. No other man could free it but Sigmund, for whom the sword easily came out of the tree.
Siggeir wanted to purchase the sword from Sigmund, who refused. Angry, Siggeir invited Volsung and his ten sons to visit him and Signy in Gothland. Signy warned her kinsmen that her cruel husband was plotting revenge, but the Volsungs accepted Siggeir's invitation. When they arrived in Gothland, Signy warned them again, to no avail. The Volsungs were ambushed in a forest and bound to a fallen tree. Each night a wolf came and devoured one of them, until finally only Sigmund was left alive. Signy could do nothing to help her family because she was closely watched by Siggeir, but she was able to tell one of her servants to go to the woods and cover Sigmund's face with honey. The wolf was attracted by the sweet odor and licked Sigmund's face. Sigmund was able to catch the beast's tongue between his teeth and struggle free.
The next day, Siggeir's messenger reported that nothing was left of the prisoners but a heap of bones. Signy was able to go into the forest to bury these bones, and there she encountered Sigmund. She and her brother vowed to take revenge on Siggeir.
Believing that only a pure-blooded Volsung could aid them in avenging the Volsungs, Signy disguised herself as a gypsy and seduced her brother, conceiving a boy she named Sinfiotli. Sigmund did not realize that the gypsy was his sister. When Sinfiotli reached maturity, Signy sent him to Sigmund to be trained.
When Sigmund and Sinfiotli tried to kill Siggeir, he captured them and cast them into his dungeon, ordering that they be starved to death. Signy was able to cast a bundle of straw into Sigmund's cell before it was locked; hidden in the straw was Balmung, Sigmund's magic sword. Sigurd and Sinfiotli were able to break free. They killed Siggeir and his men, setting the palace on fire. Signy refused to be saved, however; she told Sigmund that Sinfiotli was his son and then stepped back into the burning palace.