# Treaties of Wehlau and Bromberg (1657)

URL: https://poland-history.com/timeline/1657-treaties-of-wehlau-and-bromberg
Location: Bydgoszcz

Poland recognised the full sovereignty of Ducal Prussia under Brandenburg's Hohenzollerns. Within the broader Polish–Lithuanian Commonwealth period: The Commonwealth of Both Nations elected its kings and prized noble liberty and religious tolerance. It won famous victories but was weakened by wars with Sweden, Russia, the Ottomans and the Cossacks, and by political paralysis. At this point in the timeline (1657), the governing authority was John II Casimir Vasa (King of Poland). Reigned through the Khmelnytsky Uprising and the Swedish Deluge before abdicating in 1668. Treaties of Wehlau and Bromberg mattered because its terms redrew borders or alliances and constrained Poland's options for years to come. The event is placed here so readers can follow it alongside changes in government, warfare, society, religion and culture across Polish history.

## Why it matters
Treaties of Wehlau and Bromberg mattered because its terms redrew borders or alliances and constrained Poland's options for years to come.

Ruler at the time: [John II Casimir Vasa](https://poland-history.com/rulers/john-ii-casimir-vasa)

## Sources
- [Wikipedia — Treaty of Bromberg](https://en.wikipedia.org/wiki/Treaty_of_Bromberg)
- [Encyclopaedia Britannica topic lookup — Treaties of Wehlau and Bromberg](https://www.britannica.com/search?query=Treaties+of+Wehlau+and+Bromberg)
- [Wikipedia — Polish–Lithuanian Commonwealth (period overview)](https://en.wikipedia.org/wiki/Polish%E2%80%93Lithuanian_Commonwealth)