King Sweyn I Tjugeskjegg "Forkbeard" Haraldsson of Denmark
- Born: Bef 965, Denmark
- Christened: 985, Denmark
- Marriage: Gunhilda of Poland/ Sigríð the Haughty (Stórráða) of Poland Sweden Norway & Denmark Queen Of Sweden, Queen of Denmark in 998 in Denmark
- Died: 3 Feb 1014, Gainsborough, Lincolnshire, England
- Buried: 1014, Roskilde, Sjælland, Denmark
Another name for Sweyn was Otto (Christian name given when his father converted to Christianity).
Sweyn married Gunhilda of Poland/ Sigríð the Haughty (Stórráða) of Poland Sweden Norway & Denmark Queen Of Sweden, Queen of Denmark, daughter of Mieszko I Prince Of Poland and Dúbravka von Böhmen Princess of Bohemia, in 998 in Denmark. (Gunhilda of Poland/ Sigríð the Haughty (Stórráða) of Poland Sweden Norway & Denmark Queen Of Sweden, Queen of Denmark was born in 967 in Poznañ, Poznañ, Poland and died after 8 Feb 1014.)
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