Treaty of Bromberg
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The Treaty of Bromberg (German: Vertrag von Bromberg) or Treaty of Bydgoszcz was a political act signed by King John II Casimir of Poland and Elector Frederick William of Brandenburg-Prussia in the city of Bromberg (Bydgoszcz) on November 6, 1657. The intent of the treaty (together with the earlier Treaty of Wehlau) was to draw Prussia out of its alliance 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 Lauenburg and Bütow Land, including the towns Bütow (now Bytów) and Lauenburg in Pommern (now Lębork), as well as Draheim.

