Grimhild

In Norse mythology, Grimhild was a beautiful but evil woman. She was married to king Gjúki, of southern Rhine, Burgundy. She had three sons named; Gunnar, Hogni, Guttorm, and a daughter Gudrun. She is the sorceress who gave Sigurd a magic potion that makes him forget that he ever married his wife Brünnehilde, so that he will marry Gudrun, her daughter. But she did not stop there. She wanted her son Gunnar to marry Brünnehilde, but she refused to marry him, and she would only marry the man who could cross the ring of flames she put up around herself. So Grimhild talks Sigurd into helping Gunnar marry Brünnehilde. Since Sigurd was the only one who could cross the flames him and Gunnar switched bodies, so Gunnar's body could cross the flames. Brünnehilde then married Gunnar, because she made a promise. When Brünnehilde learned that Sigurd had betrayed her with another woman (Gudrun), not knowing he had been bewitched into doing so by Grimhild, she was out to get revenge. She ended up killing Sigurd and herself by the end of the saga. But Grhimhild didn't stop there. Then she made Gudrun marry Atli, which is Brünnehilde's brother. Gudrun didn't want to marry him because she knew he would end up killing her brothers. This was the last that we hear of Grimhild is the Völsunga saga.