Which Macbeth character is based on a son from The Danish House of Knytlinga?
Svein Knutsson Svein Knutsson (Old Norse: "Sveinn Knútsson") c. 1016–1035, was the son of Cnut the Great, king of Denmark, Norway, and England, and his first wife Ælfgifu of Northampton, a Mercian noblewoman. In 1017 Cnut married Emma of Normandy, but there is no evidence that Ælfgifu was repudiated, and in 1030 Cnut sent her and Svein as regents to rule Norway. However, their rule was considered oppressive by the Norwegians, and they were expelled in 1034. They imposed new taxes and harsh laws that made them unpopular. In William Shakespeare's "Macbeth", there is a character called "Sweno, the Norways' king" based on Svein.
Causantín mac Cináeda Causantín or Constantín mac Cináeda (in Modern Gaelic: "Còiseam mac Choinnich "; died 877) was a king of the Picts. He is often known as Constantine I in reference to his place in modern lists of kings of Scots, but contemporary sources described Causantín only as a Pictish king. A son of Cináed mac Ailpín ("Kenneth MacAlpin"), he succeeded his uncle Domnall mac Ailpín as Pictish king following the latter's death on 13 April 862. It is likely that Causantín 's (Constantine I) reign witnessed increased activity by Vikings, based in Ireland, Northumbria and northern Britain. He died fighting one such invasion.