Accession to the throne Sweyn was born in
England, as the son of
Ulf Thorgilsson and
Estrid Svendsdatter, the latter of whom was the daughter of King
Sweyn I Forkbeard and sister of Kings
Harald II and
Canute the Great. Sweyn grew up a military leader, and served under King
Anund Jacob of Sweden for a time. The Danish king
Harthacnut, Sweyn's cousin, made him a
jarl, In 1043, Sweyn fought for Magnus at the
Battle of Lyrskov Heath at
Hedeby, near the present-day
border of Denmark and Germany.
Feud with Harald Hardrada Harald, unwilling to relinquish Denmark, attacked Sweyn and fought a long war. Harald sacked
Hedeby in 1050, and also sacked
Aarhus. When Sweyn and the Danish army did not show up, Harald sent home a large part of his army, only keeping the more professional warriors in his fleet. When Sweyn finally came to meet Harald, his fleet numbered 300 ships to Harald's 150. The fleets met at night and the battle lasted until morning, when the Danes started to flee. In the sagas the Norwegian victory is largely credited to earl Haakon Ivarsson, who disengaged his ships from the Norwegian flanks and started attacking the weakened ships on the Danish flanks. This might be the aiding Norwegian chieftain that Saxo Grammaticus refers to, as turning the tide in Norwegian favour. Sweyn managed to escape the battle, reached land and stopped at the house of a peasant to ask for something to eat. "What was the terrible rumbling in the night?" she asked. "Didn't you know the two kings were fighting all night?" asked one of Sweyn's men. "Who won, then?" the woman asked. "Norwegians," came the reply. "It's a shame on us, for a king we already have. He limps and is timid." "No," King Sweyn explained, "Timid the king of the Danes is assuredly not," defended another of the king's men, "but luck isn't with him and he lacks a victory." The housecarl brought the men water and a towel to wash themselves. As the king was drying his hands, the woman tore the cloth from him, "You should be ashamed of yourself for using the whole towel for yourself," she scolded. "The day will come when I will have your permission to use the whole cloth," was the king's comment. Her husband gave the king a horse,, and Sweyn continued on his way to Zealand. Some time later, the peasant was called to Zealand and given lands there for his service to the king, but his wife had to remain behind in Halland. He set the dioceses up by donating large tracts of land, with the
Diocese of Roskilde being the most-favoured one, as he had a good relationship with
Bishop Vilhelm. The remains of other Danish kings are also entombed in Roskilde Cathedral. According to the saga, Sweyn's mother was entombed inside a pillar across from the chapel. However, analysis of mitochondrial DNA proved that this person was not the king's mother. ==Legacy==