Treaty of Bydgoszcz
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The Treaty of Bydgoszcz (German: Vertrag von Bromberg) was a political act signed by King John II Casimir of Poland and Elector Frederick William of Brandenburg-Prussia in the city of Bydgoszcz on November 6, 1657. The intent of the treaty (together with the earlier Treaty of Wehlau) was to draw Prussia out of an alliance she had with Sweden during The Deluge. In the treaty, both the king and the margrave signed a military alliance. In addition, Frederick William was granted a fief of the towns Bytów (Bütow) and Lębork (Lauenburg).