Conflicts & Resolutions · Treaty

Treaty of Wehlau

1657 · 17th century · Also known as Treaty of Wehlau-Bromberg · Part of the Second Northern War

The Treaty of Wehlau was signed on 19 September 1657 between Poland-Lithuania and Frederick William, the Great Elector of Brandenburg, during the Second Northern War. In return for the elector abandoning his alliance with Sweden, King John II Casimir released the Duchy of Prussia from Polish overlordship, giving Brandenburg full sovereignty there. It was confirmed by the Treaty of Bromberg later that year.

Treaty of Wehlau
Image: Pit1233 · Public domain · Wikimedia Commons

Mentioned in 1 profile

Kingdom of PrussiaFoundation

Mentioned in 1 state history

Duchy of Prussia

See also

Cite this entry
APA
The Epoch Institute. (2026). Treaty of Wehlau. In The Epoch Institute Encyclopedia. https://the-epoch-institute.org/encyclopedia/treaty-of-wehlau
MLA
“Treaty of Wehlau.” The Epoch Institute Encyclopedia, The Epoch Institute, 2026, https://the-epoch-institute.org/encyclopedia/treaty-of-wehlau. Accessed .
Chicago
The Epoch Institute. “Treaty of Wehlau.” The Epoch Institute Encyclopedia. 2026. https://the-epoch-institute.org/encyclopedia/treaty-of-wehlau.
Harvard
The Epoch Institute (2026) ‘Treaty of Wehlau’, The Epoch Institute Encyclopedia. Available at: https://the-epoch-institute.org/encyclopedia/treaty-of-wehlau (Accessed: ).

Last reviewed October 2026Random entry ↻