Treaty of Zboriv

Timeline

1. 1649Zbaraz · UkraineDuring the siege of Zbaraz, Polish forces were trapped in the castle, while the Cossacks, facing the departure of their Tatar allies and supply difficulties, could not win quickly. Both sides felt the stalemate too costly, and with mediation by clergy and nobles they began talks, creating the conditions for the Treaty of Zboriv.
2. 1649Zboriv · UkraineThe two sides formally signed a peace at Zboriv. The Polish king recognized Cossack autonomy in the Kyiv, Bratslav, and Chernihiv provinces, registered 40,000 Cossacks, and restored their traditional rights of electing leaders, jurisdiction, and military affairs; the Cossacks swore allegiance to the king and agreed to help defend against foreign enemies.
3. 1649–1651Ukraine · UkraineThe treaty's scope of autonomy, the quota of registered Cossacks, and the handling of noble estates were interpreted differently; the Polish sejm and local nobles resisted implementation, and the lower-rank Cossacks were dissatisfied with the limited concessions. After a brief truce, tensions flared again, and the Battle of Berestechko broke out in 1651, ending the Zboriv arrangement in failure.