Treaty of Labiau

Timeline

1. 1656East Prussia · Duchy of PrussiaAfter the Battle of Warsaw (July 1656), Brandenburg's Elector Frederick William realized the situation in Poland was not yet clear and began seeking maximum advantage between Sweden and Poland. To maintain its military alliance with Brandenburg, Sweden proactively offered Frederick William full sovereignty over Prussia in exchange for his continued loyalty, and the two sides entered into intensive negotiations.
2. 1656Labiau · East PrussiaOn November 20, 1656, Sweden and Brandenburg formally signed the treaty at Labiau. Its core content: Sweden formally recognized Brandenburg's full sovereignty over the Duchy of Prussia, with Prussia no longer having Poland as its overlord; in exchange, Brandenburg pledged to continue providing Sweden with military aid and maintain its allied stance in the war against Poland.
3. 1657–1660Duchy of Prussia · Duchy of PrussiaThe sovereignty granted to Brandenburg by the Treaty of Labiau was subsequently given final formal recognition by Poland through the Treaty of Wehlau (1657) and the Treaty of Oliva (1660). This allowed the Elector of Brandenburg to achieve the organic integration of the 'Brandenburg-Prussia' territories, laid the legal foundation for the establishment of the Kingdom of Prussia in 1701, and was a key step in Prussia's rise as a great power.