Kriemhild

Kriemhild, in Germanic heroic legend, sister of the Burgundian kings Gunther, Gernot, and Giselher. In Norse legend she is called Gudrun, and the lays in which she appears are variant tales of revenge. In the Nibelungenlied, she is the central character, introduced as a gentle princess courted by Siegfried. He wins Kriemhild’s hand by performing feats for Gunther in the wooing of Brunhild. When Siegfried is later killed on Gunther’s order because of Brunhild’s spite at his role in wooing her, Kriemhild’s grief transforms her into a “she-devil” in the second part of the epic. She marries Etzel (Attila the Hun) for revenge on her brothers, which she achieves by inviting them to Etzel’s court, where she has them killed. She herself is killed by Hildebrand, the weapons master of Dietrich von Bern.

(source: Encyclopedia Britannica)