Völsung
... In Iceland, the tales of the Völsung cycle were expanded with native Scandinavian folklore, including that of Helgi Hundingsbane, which originally appears to have been part of a separate tradition, that of the Ylfings, and form the material of the epic poems in the Elder Edda and of Völsunga saga, which preserves material from lost poems ... According to Völsunga saga, Völsung was murdered by the Geatish king Siggeir and avenged by one of his sons, Sigmund, and his daughter Signy, who was married to Siggeir ...