Sigurd Ring (Old Norse: Sigurðr Hringr, in some sources merely called Hringr) according to legend was a king of the Swedes, being mentioned in many old Scandinavian sagas. According to these sources he was granted rulership over Sweden as a vassal king under his uncle Harald Wartooth. Later he would take up arms against his uncle Harald in a bid to overthrow him and take the crown of Denmark, a conflict which Sigurd eventually won after the legendary Battle of the Brávellir, where it is said that Odin himself intervened and killed Harald. In the Sagas, Sigurd is also known for being the father of the Norse Viking hero and legendary king of Denmark and Sweden, Ragnar Lodbrok. According to Bósa saga ok Herrauds, there was once a saga on Sigurd Ring, but this saga is now lost. Hervarar saga The Hervarar saga tells that when the Danish tributary king Valdar died, his son Randver became the king of Denmark, while his older brother Harald Wartooth took royal titles in Gautland. Then Harald subjugated all the territories once ruled by his maternal grandfather Ivar Vidfamne (Sweden, Denmark, Curonia, Saxony, Estonia, Gardarike, Northumberland). After Randver's death in battle in England, his son Sigurd Ring became the king of Denmark, presumably as the subking of Harald. Sigurd Ring and Harald fought the Battle of the Brávellir (Bråvalla) on the plains of Östergötland where Harald and many of his men died. Sigurd Ring ruled Denmark until his death and was succeeded by his son Ragnar Lodbrok. Harald Wartooth, however, had a son called Eysteinn Illruler who ruled Sweden until he was killed by Björn Ironside, a son of Ragnar Lodbrok. Sögubrot af nokkrum fornkonungum In Sögubrot af nokkrum fornkonungum, Ring (mostly mentioned without the name element Sigurd) is the paternal nephew of the Danish king Harald Wartooth, and presumably (the part of Sögubrot where this would have been narrated expressly has not been preserved) the son of Randver, who in his turn is the son of Harald's mother Auðr the Deep-Minded and her husband king Raðbarðr of Gardariki. Harald Wartooth was beginning to feel old, so he made Ring the king of Uppland, with the commission to rule Sweden and Västergötland. When Harald reached the extraordinary age of 150, he desired to die like a king in battle, and therefore challenged Ring to meet him in the field. Ring gathered manpower from Sweden,