Which Norse heroine killed her husband Atli to avenge her brothers? Gudrun did.
In the heroic poems of the Poetic Edda, Atli—often identified with the historical Hunnic ruler Attila—lures Gudrun’s brothers Gunnar and Högni to his hall and has them killed. Gudrun had warned them, but they came despite the danger.
Gudrun’s revenge is especially gruesome in Atlakviða and Atlamál. She kills her sons, serves their flesh to Atli, reveals what he has eaten, and then kills him. Some versions describe her burning the hall afterward; others give her an accomplice and a different ending.
This story belongs to Germanic heroic legend rather than securely documented biography. Gudrun is also connected with Sigurd and Brynhild, so she is sometimes confused with Brynhild, but Brynhild is a separate heroine whose tragedy centers on Sigurd.