'''Sweyn II''' Estridsson Ulfsson. (10201018?-1076) was King of [[Denmark]] 1047-76. Was the son of Ulf Thorgilsson and Estrid Margarete SVENDSDATTER, daughter of [[Sweyn I of Denmark]]. Fought [[Norway]] 's King Harald Hartharade in a long war until 1064 when Harald relinquished his claims to Denmark. After that Sweyn begun to build a strong foundation for royal power through cooperation with the church. He completed the final partition of Denmark in to dioceses, and corresponded with the Pope. Sweyn seems to have been able to read and write, and he is the source of much of our current knowledge about Denmark in the 9th and 10th centuries, having told the story of his ancestry to historian [[Adam of Bremen]] around 1070.
Sweyn Estridsson joined forces with [[Edgar Atheling]] when he attempted to regain the [[England|English]] throne from [[William I of England|William the Conqueror]]. However after capturing [[York]] Sweyn accepted a payment from William to desert Edgar, who returned into exile in [[Scotland]].
