Bohdan Khmelnytsky
Bohdan Zynoviy Mykhailovych Khmelnytsky (Ukrainian: Богдан Зиновій Михайлович Хмельницький, commonly transliterated as Khmelnytsky; Polish: Bohdan Zenobi Chmielnicki; Russian: Богдан Хмельницкий, Bogdan Khmelnitsky) (c. 1595 – 6 August 1657) was a hetman of the Zaporozhian Cossack Hetmanate of the Crown of the Kingdom of Poland in the Polish–Lithuanian Commonwealth (now part of Ukraine). He led an uprising against the Commonwealth and its magnates (1648–1654) which resulted in the creation of a Cossack state. In 1654, he concluded the Treaty of Pereyaslav with the Tsardom of Russia, which led to the eventual loss of independence to the Russian Empire.
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