Treaty of Labiau
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The Treaty of Labiau was a treaty signed between Elector Frederick William of Brandenburg and King Charles X Gustav of Sweden on November 20, 1656 in Labiau, Ducal Prussia.
Sweden had gone to war against Poland in 1656 in a conflict known there as The Deluge. The treaty called for Frederick William to assist Sweden militarily against the Poles, in return for Swedish renunciation of claims on Ducal Prussia and Warmia in favor of the elector. Frederick William had desired to acquire other territories on the Baltic Sea (primarily Royal Prussia, but also Courland, Livonia, Semigalia, and Samogitia), but these lands were to be allotted to Sweden in the event of a Swedish victory over Polish-Lithuanian Commonwealth.