Treaty of Labiau
The Treaty of Labiau was closed on Castle Labiau in Labiau on November 20, 1656 between the Elector Friedrich Wilhelm of Brandenburg and King Charles X Gustav of Sweden. He was the result of the Battle of Warsaw in 1656, the Swedes were instructed against Poland - Lithuania to the Brandenburger ( up to 9,000 ).
The Treaty Karl Gustav picked up the Swedish suzerainty over the conquered in 1655 by the Swedish troops Duchy of Prussia and the region of Warmia. He recognized the Elector, who was also Duke of Prussia in personal union, as " supreme, absolute and sovereign prince of Prussia ." In the anticipated victory of peace over Poland Sweden should get the Polish Royal Prussia proportion, also the Duchy of Courland and Semgallen, the Lithuanian Duchy of Polotsk and Polish Livonia. In contrast, the Elector gave up the compensation from Polish territory, which had been promised him Sweden in the Treaty of Marienburg, but received the harbor fortress pillau. By now complete sovereignty Friedrich Wilhelm could developing Kurbrandenburgische Navy.
In Oliva Monastery, the contract was confirmed in the Treaty of Oliva after the Second Northern War, 1660.