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Björn Haraldsen Ironside (Björn Järnsida) (died 1134) was a Danish prince.
Bjorn was one of the 15 sons of Prince Harald Kesja. Björn married Princess Katarina Ingesdotter of Sweden, the daughter of King Inge I of Sweden. Björn was the father of Christina Bjornsdatter, a Swedish queen.
Björn was executed by orders from his uncle, King Eric II of Denmark. Bjorn died on 4 June 1134 following the Battle of Fotevik (Slaget ved Fodevig) in Skåne where the forces of his father were decisively defeated. Harald Kesja had sided with King Niels I of Denmark and his son Magnus I of Gothenland and fought with him against King Eric II. After the defeat, Harald Kesja and eight of his sons was taken captive near Vejle on Jutland and decapitated. 
|Ancestors of Björn Haraldsen Ironside
- ^ Johannes C. H. R. Steenstrup. "Medieval Danish Families: Two sons of Harald Kesja". Retrieved 2010-12-22.
- ^ Harald Kesja (Dansk biografisk Lexikon)