the immediate ancestry of both Ulf's children and Siward's line may represent a tradition shared by relatives rather than that two independent families at about the same time both co-opting the same ancient Norwegian legend for their immediate ancestry – that Björn Boresune and Thorgils may have been brothers. In the 18th century, Danish historian Jakob Langebek suggested this bear story was allegorical, and that the brutish 'Wild' Björn, father of Thorgils, was a reference to Jomsviking brigand leader Styrbjörn the Strong (Styrbjörn Starke), depicted by sagas as the son of Olaf Björnsson, king of Sweden. The sagas relate that Styrbjörn was the first husband of Tyra, the daughter of Harold Bluetooth, king of Denmark and Norway. No children or wife are assigned to Styrbjörn in a 10th-century chronicle attributed to a witness of the events in Harald Bluetooth's life, Gesta Wulinensis ecclesiae pontificum, and Otto Brenner's detailed study of the descendants of Gorm the Old gives his granddaughter Tyra and Styrbjörn no children. Children Ulf (died 1027) – Earl in Denmark and brother-in law of King Cnut the Great. His son became King Sweyn II of Denmark. Eileifr (Eglaf), named in a Supplement to Jómsvíkinga saga as "Eilífr Þorgilsson, bróðir Úlfs", he was one of the leaders of Thorkell the Tall's 1009 invasion of England, and appears between 1019 and 1024 as an earl under King Cnut with jurisdiction centered on Gloucester. He ravaged the South Wales coastal region in 1022/3, but apparently left England for Scandinavia in 1024. Gytha Thorkelsdóttir – married Godwin, Earl of Wessex; mother of King Harold Godwinson of England and Edith of Wessex, Queen of King Edward the Confessor. References Viking warriors Year of birth unknown Year of death unknown 11th-century Danish people 10th-century Danish people House of Estridsen 11th-century Vikings