Bohdan Khmelnytsky was which of the following?

Bohdan Khmelnytsky was the Leader of the Ukrainian Cossacks. He is known for his role in the Cossack uprising against Polish rule in the mid-17th century, which eventually led to the establishment of the semi-independent Cossack Hetmanate. Khmelnytsky's leadership and military skills were instrumental in galvanizing the Ukrainian Cossacks, uniting them under a common cause, and leading them to numerous victories against the Polish forces. He is revered as a national hero in Ukraine and is considered a symbol of Ukrainian independence and resistance against foreign oppression.