Sigurd's daughter Aslaug married Helgi the Sharp (the great-great-grandson of king Ring of Ringerike) of the Dagling dynasty. They had the son Sigurd Hart, who married Ingeborg, the daughter of the Jutish chieftain Harald Klak. Sigurd Hart and Ingeborg had the children Guttorm and Ragnhild. When his uncle king Fróði of Ringerike died, Sigurd Hart went to Norway to succeed him as king.
[source Wikipedia http://en.wikipedia.org/wiki/Sigurd_Snake-in-the-Eye]
Je n'ai pas retenu que Helgi le Tranchant soit le père de Sigurs Hart afin de ne pas provoquer un saut colossal de générations. J'ai préféré un autre Helge comme l'indique Krystad history and genealogy.