Sweyn Forkbeard was a Viking king who ruled over Denmark and later became the King of England in 1013. He was born around 960 and was known for his military prowess and leadership. Sweyn led several raids against England, aiming to expand his territory and influence. His reign in England was short-lived, lasting only a few months before his death in 1014. Sweyn was the father of Cnut the Great, who would go on to become a significant ruler in both England and Denmark. Sweyn's legacy is marked by the establishment of Viking power in England and the eventual unification of the Scandinavian kingdoms.