Sveinn I
Sveinn I Viken (The Kalmar Union).png
Sveinn I Knutsson
King of Viken
Reign 1032-1035
Predecessor Cnut I
Successor Magnus I
Born 1016
Died 1035
Full name
Sveinn Knutsson or Alfífuson, or Óforsynjukonungr
House Denmark or Gorm
Father Cnut I Sweynsson
Mother Aelfgifu of Northampton

After the deaths of two vassal lords ruling Viken on his behalf in quick succession Cnut set his son Sveinn as his regent in Viken in 1030. As a minor it would be his English mother Aelfgifu who effectively ran the country. She was widely disliked however as the authorities attempted to impose punative Danish laws on the land. It also angered several lords who believed Cnut had promised them rulership. Eventually Cnut was forced to invade in 1031 to restore his son to the throne.

Sveinn would rule in his own right from 1032 though was often reliant on Danish forces to keep his throne. He was frequently threatened by lords conspiring with the heirs of the Fairhair dynasty who looked to remove Danish influence from both Viken and Hordaland. Eventually the forces of Magnus I overcame Sveinn's in 1035. Fleeing to Denmark he would die shortly afterwards leaving his inheritance to be fought over between his half-brother Harthacnut (Cnut III) and Magnus.

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