Opinions are divided on whether the location was at Helgeå in Uppland or the Helgeå of eastern Skåne.
However, in 1026 King Olaf lost the Battle of the Helgeå, and the Norwegian nobles rallied round the invading King Cnut the Great of Denmark, forcing King Olaf to flee the country.
Cnut took Olaf's fleet by surprise and took the battle to the Swedish fleet at the Battle of the Helgeå.
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