The "Hervarar saga" (13th century) describes Stenkil as the son of a Ragnvald the Old, and later historians have identified this father as Ragnvald Ulfsson who was the earl of Staraja Ladoga and the grandson of the legendary Viking Skoglar Toste.
The "Hervarar saga" (13th century) describes Stenkil as the son of Ragnvald the Old and Astrid Njalsdotter, the daughter of Njal Finnsson from Hålogaland in Norway and a cognatic descendant of Harald Fairhair. Later historians have identified the father of Stenkil Ragnvald Ulfsson who was the earl of Staraja Ladoga and the grandson of the legendary Viking Skoglar Toste.