Krzysztof Kosiński, also Kryshtof Kosynsky of Rawicz Coat of Arms (, Kryshtof Kosynsky; ; 1545 – 1593) was a Cossack noble from the Podlachia region. He was a colonel of the Registered Cossacks and self-proclaimed Hetman of Ukraine. He led two consecutive rebellions against local Ruthenian nobility, known as the Kosiński Uprising. His forces were first defeated by Duke Janusz Ostrogski in the Battle of Piątek on 2 February 1593. Kosiński promised to subject his forces to the Polish Monarchy; however, he soon escaped to Zaporizhia, where he began organizing a new army. In 1593 he set out for Cherkasy but was soon killed. See also Severyn Nalyvaiko References External links Kosynsky, Kryshtof in the Encyclopedia of Ukraine, vol. 2 (1989). Polish Cossacks 1545 births 1593 deaths Seniors of Registered Cossacks Ruthenian nobility of the Polish–Lithuanian Commonwealth Cossack rebels