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The Treaty of Bydgoszcz was a political act signed by the King of Poland Jan Kazimierz and the prince-elector of Brandenburg Frederick William I in the city of Bydgoszcz on November 6, 1657. The treaty (together with the earlier Treaty of Welawa) was to draw Prussia out of an alliance she had with Sweden during The Deluge.
In the treaty both the king and the prince-elector signed a mutual military alliance. In addition, Frederick William was granted a fief of Bytów and Lębork.
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