Krzysztof Kosià Âski, also known as Kryshtof Kosynsky (; 1545âÂÂ1593), was a Polish-Cossack noble from the Podlachia region. He was a colonel of the Registered Cossacks and self-proclaimed hetman. He led two consecutive rebellions against the local Ruthenian nobility, known as the Kosià Âski uprising.
The Kosià Âski uprising (1591âÂÂ1593) is a name applied to two rebellions in the eastern parts of the PolishâÂÂLithuanian Commonwealth (modern-day Ukraine) organised by Krzysztof Kosià Âski against the local Ruthenian nobility and magnates.
His forces were first defeated by Duke Janusz Ostrogski in the Battle of Piàtek on 2 February 1593. Kosià Âski promised to subject his forces to the Polish Monarchy; however, he soon escaped to Zaporizhzhia, where he began organizing a new army. In 1593, he set out for Cherkasy but was soon killed.