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16th to 18th-century Cossack polity in modern southern Ukraine

The Zaporozhian Sich was a semi-autonomous polity and proto-state of Zaporozhian Cossacks that existed between the 16th to 18th centuries. For the latter part of that period, it was an autonomous stratocratic state within the Cossack Hetmanate. The lands of Zaporozhian Sich were centred around the Great Meadow region of Ukraine, spanning the lower Dnieper river. In different periods the area came under the sovereignty of the Polish–Lithuanian Commonwealth, the Ottoman Empire, the Tsardom of Russia, and the Russian Empire.