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- Ulf belonged to a prominent Swedish family since he was the son of Thorgils Sprakal?gg who is considered to have been the son of Styrbj?rn the Strong and Tyra, the daughter of Harald Bluetooth. He was consequently closely related to both the Swedish and Danish royal houses. His title "jarl" corresponds to English earl. Ulf joined Canute the Great's expedition to England. Circa 1015 he married Canute's sister Estrid (Estrith, Astrith, Margarete) and was appointed the Jarl of Denmark which he ruled when Canute was absent. However, some source state that the identification of Ulf with the husband of Estrid is commonly made but not certain. He was also the foster-father of Canute's son Harthacanute.
When the Swedish king Anund Jakob and the Norwegian king Saint Olaf took advantage of Canute's absence and attacked Denmark, Ulf convinced the freemen to elect Harthacanute king, since they were miscontent with Canute's absenteeism. This was a ruse from Ulf since his role as the caretaker of Harthacanute would make him the ruler of Denmark. When Canute learnt of what had happened in 1026, he returned to Denmark and with Ulf Jarl's help, he defeated the Swedes and the Norwegians at the Battle of the Helge?. This service, did not, however, make Canute forgive Ulf for his coup. At a banquet in Roskilde, the two brothers-in-law were playing chess and started arguing with each other. The next day, the Christmas of 1026, Canute had one of his manservant kill Ulf in the church of Trinity. The accounts of the two brothers and Ulf's death are contradictory.
After Ulf's death, his widow Estrid married Robert, Duke of Normandy, a marriage mentioned by Ralph Glaber in his Historiarum libri quinque. This match ended in divorce, and was childless; Robert's children including William the Conqueror were illegitimate. Adam of Bremen gives a misleading account, as to the date, and the Duke involved. Through their son Svend, Estrid and Ulf are the ancestors of the Danish royal house which would rule Denmark 1047-1375.
This database researched and compiled by Norman Lee Madsen, Toronto, Ontario, Canada, 21 July 2015.
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