Khmelnytsky Uprising

The Khmelnytsky Uprising, also known as the Cossack–Polish War, Khmelnytsky insurrection, Cossack Revolution, or, in Ukraine, as the National Liberation War, was a successful Cossack rebellion with elements of religious war that took place between 1648 and 1657 in the eastern territories of the Polish–Lithuanian Commonwealth. Originating in Dnieper Ukraine, the uprising resulted in a Cossack victory and led to the creation of the Cossack Hetmanate. Under the command of Cossack Hetman Bohdan Khmelnytsky, the Zaporozhian Cossacks, supported by the rebelling Ruthenian peasantry and initially allied with the Crimean Khanate, fought against the Commonwealth's forces. The war was accompanied by mass atrocities committed by Cossacks against prisoners of war and the civilian population, especially Poles, Jews, Roman Catholic and Ruthenian Uniate clergy, as well as reprisals by the Polish szlachta and army, especially Jeremi Wiśniowiecki's troops.

The uprising has a symbolic meaning in the history of Ukraine's relationship with Poland and Russia. The uprising led to the eventual incorporation of eastern Ukraine into the Tsardom of Russia initiated by the 1654 Pereiaslav Agreement. The event triggered a period of political turbulence and infighting in the Hetmanate known as the Ruin. The success of the anti-Polish rebellion, along with internal conflicts in Poland and concurrent invasions waged by Russia and Sweden against the Poles, ended the Polish Golden Age and caused a secular decline of Polish power during the period known as "the Deluge".

In Jewish history, the Uprising is known for the atrocities against the Jews who, in their capacity as leaseholders (arendators), were seen by the peasants as their immediate oppressors and became the subject of antisemitic violence. The Jews consider this event "the biggest national catastrophe since the destruction of Solomon's Temple." The Cossack violence during the uprising inflicted damage on the Commonwealth's Jewish communities.