Signy and Sigmund

Signy and Sigmund are twins. In their teens, Signy is married off to a neighboring chieftain, who murders all her family. She saves her brother, and hides him in the forest. She sets out to seek revenge for the murders, but only a true Volsunga can help her. She has a son with her brother and when the boy is old enough, the three plot to kill her husband in a fire. But Signy will not leave her husband out of duty, and dies with him. Sigmund becomes a great warrior, marries, and produces a son, Siegfried, who is the hero of the saga.