Fictional character in Germanic and Norse mythology
Sigurd (Old Norse: Sigurðr [ˈsiɣˌurðr]) or Siegfried (Middle High German: Sîvrit) is a legendary hero of Germanic heroic legend, who killed a dragon—known in some Old Norse sources as Fáfnir—and who was later murdered. In both the Norse and continental Germanic tradition, Sigurd is portrayed as dying as the result of a quarrel between his wife (Gudrun/Kriemhild) and another woman, Brunhild, whom he has tricked into marrying the Burgundian king Gunnar/Gunther. His slaying of a dragon and possession of the hoard of the Nibelungen is also common to both traditions.
https://en.wikipedia.org/wiki/Sigurd