Grimhild, in Norse mythology, queen of the Nibelungs, or Burgundians, wife of King Giuki, and mother of Gunnar, Hogni, and Gudrun. Grimhild often applied her knowledge of runes and sorcery to treacherous ends. According to the 'Volsunga Saga', Grimhild gave the hero Sigurd a drink of forgetfulness while he was at King Giuki's court. Sigurd forgot his love for the Valkyrie Brunhild, and married the queen's daughter, Gudrun. Sigurd was instrumental in the plot to deceive Brunhild into marrying Gunnar. In the Icelandic 'Poetic Edda', Grimhild gave Gudrun a potion in a rune-covered goblet after the murder of Sigurd. Under the potion's baleful influence, the grief-stricken Gudrun forgot the slain Sigurd and married the villainous and greedy King Atli of the Huns. The deception led to the demise of the Nibelungs.