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- Wikipedia.org: Ulf was the son of Thorgils Sprakalägg, who is claimed to have been the son of Styrbjörn the Strong, a scion of the Swedish royal house, by Tyra, the daughter of king Harald Bluetooth of Denmark. However, Thorgils' parentage may have been invented to glorify the royal dynasty founded by Ulf's son, Sweyn Estridson.
Ulf joined Cnut the Great's expedition to England. In c. 1015, he married Cnut's sister Estrid and was appointed the Jarl of Denmark, which he ruled when Cnut was absent. He was also the foster-father of Cnut's son Harthacnut.
When Cnut learnt of what had happened in 1026, he returned to Denmark and with Earl Ulf's help, defeated the Swedes and the Norwegians at the Battle of the Helgeå. Ulf's assistance did not, however, cause Cnut to 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, Cnut had one of his Housecarls kill Earl Ulf in Trinity Church, the predecessor of Roskilde Cathedral. However, accounts contradict each other.
Ulf was the father of Sweyn Estridson, and thus the progenitor of the royal house that would rule Denmark from 1047 to 1375
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- 1026
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