In Norse mythology, Grimhild or Grímhildr ("masked battle"[1][2]) was a beautiful but evil sorceress who was married to king Gjúki of Burgundy in the Völsunga saga where she is the mother of three sons, Gunnar, Hǫgni and Guthormr, and a daughter, Gudrun.
[3] The name of Grímhild[r] was also given to another beautiful and evil sorceress who married king Áli of Alfheim (modern Bohuslän) in Illuga saga Gríðarfóstra.
She then banned Signý and Hild, her daughter, from the kingdom and put a curse on them, that Signy would turn into a troll woman named Grid and they would have to live in a cave.
[4] Eleven years and sixteen men later, a young Dane named Illugi broke Grímhild's curse by defeating and burning all of her daughters, thus also causing her to die in the fire at last.
[5] In Gríms saga loðinkinna, Grímhild was an evil princess who became the wife of Harald, the North Norwegian lord of the Oslofjjord, and put a curse on her stepdaughter Lofthaena to turn her into an ugly troll.