Next Sigurd comes to King Gjuki at the Rhine, and joins in friendship with him and his sons Gunnar and Hogni. Queen Grimhild gives Sigurd a potion which causes him to forget Brynhild and be filled with love for her own daughter Gudrun, whom he marries. Gunnar now seeks Brynhild for wife, and Sigurd goes with him on his wooing-journey. They come to the castle encircled by fire, where Brynhild lives. She will be wooed only by him who will ride to her through the flames. Gunnar tries in vain to do this, even when mounted on Sigurd's steed Grani. Sigurd and Gunnar then exchange shapes and the former spurs Grani through the flames. He calls himself Gunnar the son of Gjuki, and finally Brynhild consents to become his wife. Three nights he shares her couch, but always his sharp sword lies between them. He takes the ring from her finger and places in its stead one from Fafnir's treasure. Then he exchanges form again with Gunnar, who is soon after wedded to Brynhild. Only now does Sigurd recollect the oath that he once swore to Brynhild himself. One day Brynhild and Gudrun are bathing in the Rhine. A quarrel arises between them when Brynhild takes precedence of Gudrun by going into the water above her in the stream, saying that her husband is a braver and mightier man than Gudrun's. Gudrun retorts by revealing the secret that it was Sigurd in Gunnar's form, and not Gunnar himself, who rode through the flame, and in proof thereof shows her the ring taken by Sigurd from Brynhild's finger. Pale as death, Brynhild goes quietly home: Gunnar must die, she says in wrath. Sigurd tries to pacify her, even offering to desert Gudrun. Now she will have neither him nor another, and when Gunnar appears she demands of him Sigurd's death. In spite of Hogni's protest Gunnar's stepbrother Gutthorm, who has not sworn blood-friendship with Sigurd, is got to do the deed. He is given the flesh of wolf and serpent to eat in order to make him savage. Twice Gutthorm goes to kill Sigurd, but cowers before the piercing glance of his eyes; at last he steals upon Sigurd asleep and thrusts his sword through him. The dying Sigurd hurls the sword after the fleeing murderer and cuts him in two. To Gudrun, who wakes from sleep by his side, he points to Brynhild as the instigator of the crime, and dies. Brynhild rejoices at the sound of Gudrun's wailing. Gudrun cannot find relief for her grief, the tears will not flow. Men and women seek to console her by tales of greater woes befallen them. But still Gudrun cannot weep as she sits by Sigurd's corpse. At last one of the women lifts the cloth from Sigurd's face and lays his head upon Gudrun's lap. Then Gudrun gazes on his blood-besmirched hair, his dimmed eyes, and breast pierced by the sword: she sinks down upon the couch and a flood of tears bursts at length from her eyes.