The name of Grimhild is transferred to Gudrun's mother, the "wise wife," a semi-daemonic figure, who brews the potion that makes Sigurd forget his love for Brunhild and his plighted troth.
In the Nibelungenlied King Gunther and Queen Brunhild hold their court at Worms, and Siegfried comes hither to woo Kriemhild.
The rider through the fire wins Brunhild but this may belong to another cycle of ideas.
On the summit of a fire-girt hill Sigurd found the Valkyrie Brunhild in an enchanted sleep, and ravished by her beauty awakened her; they plighted their troth to each other and, next morning, Sigurd left her to set out once more on his journey.
Queen Grimhild, skilled in magic, therefore gave him an enchanted drink, which caused him to forget Brunhild.