Kriemhild or Gúdrun, is the wife of Sigurd, the beloved of Brynhilde, in "the Ring of Nibelungs" germanic legend.
In Norse mythology, she was the sister of Gunnar. Kriemhilde/Gudrun fell in love with Sigurd, who did not care for her, because he was in love with the valkyrie Brynhild, to whom he gave the ring Andvarinaut. Gudrun's brother Gunnar, however, wished to marry Brynhild, but this was impossible because Brynhild, knowing that only Sigurd could do so, had sworn to marry only the man who could defeat her in a fair fight.
Her mother Grimhild, who is called Ute in the Nibelungenlied, gave her a potion to make Sigurd forget his love for Brynhild. Gunnar allowed Sigurd to marry Gudrun under the condition, that Sigurd would win Brynhild for him. Sigurd succeeded in doing so; taking the shape of Gunnar, he took Andvarinaut from Brynhild and gave it to Gudrun as his morning gift. Both queens, Gudrun and Brynhild, were married on the same day.
Later, when Brynhild learned that she had been tricked into marrying an inferior man, she exacted vengeance by telling Gunnar that Sigurd had taken liberties with her, and Gunnar had Sigurd killed. Gudrun was so overcome with grief that she could not weep, and the court feared for her life. Finally her sister showed Gudrun Sigurd's corpse, and her tears flowed at last. She lamented her lost husband and predicted the death of his killer, her own brother Gunnar.
Gudrun later married the king Atli (Atilla the hun), since in the northern version Atli is responsible for the death of her whole family. The queen took revenge for her family by killing her two sons by Atli, Erp and Eitil, and serving them to their father at a feast. Then, when he was solidly drunk, she set fire to the Atli's hall, killing him along with all of his men, then tried to drown herself by jumping into the sea with an armful of stones.
She was a burgundian queen (a ancient germanic tribe from a region historically situated in modern-day France and Switzerland).
She appears as Kriemhild in the Nibelungenlied and as Gutrune in Wagner's Der Ring des Nibelungen
picture of the outfit: [link]
a little more of Kriemhilde can be found here: [link]