The Håtuna games (Swedish: Håtunaleken) were a 1306 conflict between Birger, King of Sweden (1280–1321) and his two brothers, the dukes Eric Magnusson (ca.
In 1304 his brothers signed a document that forbade them from conducting their own foreign policy and kept them out of the royal court unless they had specifically been summoned.
A civil war broke out, but by 1306 emotions had cooled to the point where the dukes acknowledged the son of Birger, Magnus Birgersson, as the successor to the throne.
Birger and his wife Martha of Denmark were captured by the dukes, and were imprisoned in the dungeon in Nyköping Castle.
Duke Eric's brother Valdemar wreaked revenge by plundering Skåne with a force of German mercenaries.