History of Ukraine significant event Khmelnytsky Uprising
Cossack era
The 1648 Ukrainian Cossack (Kozak) rebellion or Khmelnytsky Uprising, which started an era known as the Ruin (in Polish history as The Deluge), undermined the foundations and stability of the Commonwealth. The nascent Cossack state, the Cossack Hetmanate, usually viewed as precursor of Ukraine, found itself in a three-sided military and diplomatic rivalry with the Ottoman Turks, who controlled the Tatars to the south, the Commonwealth of Poland and Lithuania, and the Tsardom of Muscovy to the East.The Zaporizhian Host, in order to leave the Polish–Lithuanian Commonwealth, sought a treaty of protection with Russia in 1654. This agreement was known as the Treaty of Pereyaslav. Commonwealth authorities then sought compromise with the Ukrainian Cossack state by signing the Treaty of Hadiach in 1658, but—after thirteen years of incessant warfare—the agreement was later superseded by the 1667 Polish–Russian Treaty of Andrusovo, which divided Ukrainian territory between the Commonwealth and Russia. Under Russia, the Cossacks initially retained official autonomy in the Hetmanate. For a time, they also maintained a semi-independent republic in Zaporozhia, and a colony on the Russian frontier in Sloboda Ukraine.In 1686, the Metropolitanate of Kyiv was annexed by the Moscow Patriarchate through the Synodal Letter of the Ecumenical Patriarch of Constantinople Dionysius IV.
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