Bohdan Khmelnytsky, hetman of Ukraine (d. 1657)
Bohdan Zynoviy Mykhailovych Khmelnytsky (Ruthenian: Ѕѣнові Богдан Хмелнiцкiи; modern Ukrainian: Богдан Зиновій Михайлович Хмельницький; c. 1595 – 6 August 1657) was a Ukrainian military commander and Hetman of the Zaporozhian Host, which was then under the suzerainty of the Polish–Lithuanian Commonwealth. He led an uprising against the Commonwealth and its magnates (1648–1654) that resulted in the creation of an independent Ukrainian Cossack state. In 1654, he concluded the Treaty of Pereyaslav with the Russian Tsar and allied the Cossack Hetmanate with Tsardom of Russia, thus placing central Ukraine under Russian control.