The Egil's Saga on Bergonund
Chapter 1 - Of Kveldulf and his sons. > Chapter 57 - Suit between Egil and Onund.
attribution: Bergonund claimed his wife Gunnhilda was Bjorn's lawful heir and that Asgerdr's mother was a captive of war and bondwoman
"Gunnhilda my wife is the daughter of Bjorn and Alof, the wife whom Bjorn lawfully married. Gunnhilda is rightful heiress of Bjorn."
attribution: Bergonund alleged Asgerdr's mother Thora was captured from Thorir's house and was an outlaw when Asgerdr was born
"Thora Lace-hand, Asgerdr's mother, was taken captive from the house of Thorir her brother, and a second time from Brynjolf's house at Aurland."
Chapter 1 - Of Kveldulf and his sons. > Chapter 59 - King Eric slays his brothers.
attestation: Bergonund remained at home while the king went to war, thinking it unsafe to leave while Egil was in the land
"Bergonund remained at home on his estate when the king went to the war, for he thought it unsafe for him to leave home while Egil was still in the land."
attestation: Bergonund dismissed his guards and invited Frodi from Alrekstead for a great ale-drinking
"he sent away all those men that he had had before for protection. Thereafter he rowed in to Alrekstead, and bade Frodi to his house, for he had a great ale-drinking there."
Chapter 1 - Of Kveldulf and his sons. > Chapter 60 - The slaying of Bergonund and Rognvald the king's son.
attestation: The house-carle revealed that Bergonund was feasting with Frodi and only five others at his home
"here they must not drink less than was drunk at Bergonund's, though Frodi was feasting there with a party of five."
attestation: Bergonund ran forward to hunt the supposed bear in the bushes but found Egil waiting for him instead
"Bergonund ran forward to the bushes. He had helm and shield, a sword at his girdle, a halberd in his hand. Egil was there before him in the bushes, but no bear."