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|King of Norway|
|Died||1035 (aged 18–19)|
|Father||Cnut the Great|
|Mother||Ælfgifu of Northampton|
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. They imposed new taxes and harsh laws that made them unpopular and they were expelled in 1034. 
Svein Knutsson is also mentioned as Sveinn Alfífuson (matronym) and under the epithet óforsynjukonungr ("unforeseen king"). In Norwegian, his name is Svein Knutsson; in Danish, Svend Knudsen. Many variations of the name are used, including Sven and Sweyn, from the Anglo-Saxon Swegen. He was the second ruler of Norway by this name, after his grandfather Sweyn Forkbeard.
In 1029 Håkon Eiriksson, Cnut's vassal ruler of Norway, was lost at sea and Olaf Haraldsson, who had been deposed as king of Norway by Cnut, tried to recapture the kingdom, but he was defeated and killed at the Battle of Stiklestad. Cnut then sent Svein and Ælfgifu to Norway, with Ælfgifu ruling as regent on behalf of her fourteen-year-old son. This came as a great disappointment to a number of Norwegians who had wished to take the place of the Earls of Lade (Ladejarls). Nobles like Einar Tambarskjelve and Kalv Arnesson were especially disappointed because they both believed that Cnut had promised they could take power.
The 1030s were difficult years in Europe. Danish policy in Norway changed – there was closer royal involvement and strict regulations in many areas. This created the basis of a popular resistance against the new regime which can be characterised as being of the same ilk as that which Saint Olav had earlier come up against. According to the Sagas, Ælfgifu's and Svein's tax-demands and new laws created resentment.
Snorri writes that "King Svein brought in new laws on many subjects. They were modelled on Danish laws but some were much stricter. No man was allowed to leave the country without the King's permission; if he did so his property would become the King's. A person who committed murder would lose the right to land and property. If an outlaw was due an inheritance, the King would take it. At Christmas every farmer had to give the king a measure (between 15 and 20 litres) of malt from every hearth and the thigh of a three-year-old ox, this was called vinjartodde (land tax) in Old Norse, and also a bucket of butter."
According to the Heimskringla, the Battle of Soknasund occurred during 1033 in Ryfylke. Tryggve the Pretender came with an army from England. He said he was the son of Olav Tryggvason and therefore claimed the kingdom as his own. When word reached Sveinn Alfífuson and Aelgifu that Tryggve's invasion was imminent, they summoned the landholders of Halogaland and the Trondheim district to join the royal army in resisting Tryggve. Svein Knutsson and his army, probably including elite Danish troops stood against them. Sveinn and his forces made their way south to Agder, believing that Tryggve would attempt to slip through the Skagerrak and join his supporters in Viken. Tryggve, however, landed instead in Hordaland, then sailed to Rogaland to attack Sveinn's navy. The two fleets met off the island of Bokn. Svein won the Battle of Soknasund and Tryggve Olavsson was killed.
Later that same winter Kalv Arnesson and Einar Tambarskjelve met and decided to travel to Gardarike to fetch Olav Haraldsson's son Magnus. When Magnus came to Norway the people sided with him and against the Danes. Svein had to flee home to Denmark where he died a short time later. Thus the King of Denmark had to give up his claim on Norway.
As a character in Shakespeare
Svein is a back-story character in the first act of Macbeth, where Shakespeare calls him Sweno. His army arrived in Fife and began massacring Scots. He besieged Macbeth in the castle of Bertha. Duncan, the Scottish king, sent food and drink to the Norwegians, but laced it with a potion that caused them to become sleepy. Macbeth then slaughtered Sweno's army, but Sweno himself escaped. Canute and the Danes arrived to avenge this defeat, but they agreed to a truce:
Sweno, the Norway's king, craves composition [treaty].
nor would we deign him burial of his men
till he disbursed at Saint Colme's-inch
ten thousand dollars to our general use.
- Pauline Stafford, Ælfgifu of Northampton, Oxford Online Dictionary of Biography, 2004
- M. K. Lawson, Cnut, Oxford Online Dictionary of Biography, 2005
- Derry, T.K., A history of Scandinavia: Norway, Sweden, Denmark, Finland, and Iceland, U of Minnesota Press, 2000, p. 40.
- Bjørn Bandlien. "Svein Alfivason". Store norske leksikon. Retrieved June 1, 2019.
- "Svein Alfivason". lokalhistoriewiki.no. Retrieved June 1, 2019.
- Ango-Saxon England (Frank Stenton, Oxford University Press, 3rd Edition 1971, p. 398.)
- "Svein Alfivason". Norsk biografisk leksikon. Retrieved June 1, 2019.
- Snorri Sturlasson: Heimskringla, Life of St. Olaf §240
- Saga of Magnus the Good (Heimskringla, translated by Samuel Laing)
- Snodgrass, Mary Ellen, Literary Treks: Characters on the Move, pp. 106-107. 2003. ISBN 156308953X. "The playwright transposes in time a foray led by Sweyn Alfivason, son of Canute II of England and Denmark and Aelfgiva of Northhampton."
- Hudson, Henry,Introductions To Shakespeare's Tragedies, pp. 407-408.
- Shakespeare, William, The Tragedy of Macbeth, Act I
- "KINGS OF WESSEX AND ENGLAND 802–1066" (PDF). The official website of The British Monarchy. Archived from the original (PDF) on 2009-08-24. Retrieved 2015-07-05.
- Gade, Kari (trans.) (2000) Morkinskinna: The Earliest Icelandic Chronicle of the Norwegian Kings (1030-1157) (Cornell University Press) ISBN 978-0-8014-3694-9
- Hollander, Lee (trans.) (2002) Heimskringla: History of the Kings of Norway (University of Texas Press) ISBN 978-0-292-73061-8
- Jones, Gwyn (2001) A History of the Vikings (Oxford Univ. Press) ISBN 978-0-19-280134-0
- Sephton, John (trans.) (1895) The Saga of King Olaf Tryggwason (Kessinger Publishing, LLC) ISBN 978-1-116-79637-7
|Preceded by |
Cnut the Great (de jure)
as King of the Norwegians
| King of Norway |
with Cnut the Great
Magnus the Good
Hákon Eiríksson (de facto)
as Regent of Norway