Gudrun ( GUUD-roon; Old Norse: Guðrún) or Kriemhild ( KREEM-hilt; Middle High German: Kriemhilt) is the wife of Sigurd/Siegfried and a major figure in Germanic heroic legend and literature. She is believed to have her origins in Ildico, last wife of Attila the Hun, and two queens of the Merovingian dynasty, Brunhilda of Austrasia and Fredegund.
In both the Continental (German) and Scandinavian traditions, Gudrun/Kriemhild is the sister of the Burgundian king Gunther/Gunnar and marries the hero Siegfried/Sigurd. Both traditions also feature a major rivalry between Gudrun and Brunhild, Gunther's wife, over their respective ranks. In both traditions, once Sigurd has been murdered, Gudrun is married to Etzel/Atli, the legendary analogue of Attila the Hun. In the Norse tradition, Atli desires the hoard of the Nibelungen, which the Burgundians had taken after murdering Sigurd, and invites them to his court intending to kill them. Gudrun then avenges her brothers by killing Atli and burning down his hall. The Norse tradition then tells of her further life as mother of Svanhild and enemy of Jormunrekr. In the continental tradition, Kriemhild instead desires revenge for her brothers' murder of Siegfried, and invites them to visit Etzel's court intending to kill them. Her revenge destroys both the Huns and the Burgundians, and in the end she herself is killed.
In Richard Wagner's Der Ring des Nibelungen, Siegfried's wife is known as Gutrune. She fulfills the role of Gudrun/Kriemhild in the first half of the legend.
Some of the differences and similarities between Gudrun and Kriemhild in the Scandinavian and continental Germanic traditions can be seen in the following two stanzas taken from original sources. The first is Kriemhild's introduction in the Nibelungenlied:
And this is how Gudrun is described at the end of the Eddic poem Atlakviða: