Brunhild (or Brynhild), was one of the Valkyries, daughter of the principal god Odin. According to the epic 'Volsunga Saga', she was Odin's favorite until she disobeyed him. He put her to sleep surrounded by a ring of fire, which only the bravest hero could traverse. In some Norse legends, the supernaturally powerful maiden was the daughter of King Buthli and sister of Atli, king of the Huns.
In the Norse tradition, the hero Sigurd, after killing the dragon Fafnir, rode his horse, Grani, through the flames that surrounded Brunhild. When he drew his sword and cut off her coat of chain mail, Brunhild awoke. The two fell in love and spent three nights together, with Sigurd's sword between them as they slept. Sigurd gave Brunhild the magic ring of the Nibelungs before he went on to the court of King Giuki, where he was given a magic drink that made him forget his pledge to Brunhild. In time he married Giuki's daughter Gudrun, and then helped Gudrun's brother Gunnar win Brunhild for himself.
Sigurd accompanied Gunnar back to Brunhild's ring of fire. Gunnar's horse refused to leap into the ring of fire. Disguised as Gunnar, Sigurd rode through the flames without hesitation. Deceived into thinking it was Gunnar who had shown himself worthy of her hand, Brunhild married Gunnar.
Unaware that her love Sigurd had been given a potion to forget her, Brunhild unhappily resigned to her marriage to Gunnar. But when Brunhild discovered how she had been deceived into marrying Gunnar, her humiliation and resentment became outright hatred directed against Sigurd. In some versions, Brunhild incited Gunnar's brother Hogni to kill Sigurd, in others, Hogni and Gunnar convinced their stepbrother Guttorm to commit the murder. Brunhild, her quest for vengeance against Sigurd achieved, stabbed herself and was burned on Sigurd's funeral pyre.