Final answer:
The Cossack rebel against Catherine the Great was Pugachev. Pugachev led a major uprising known as Pugachev's Rebellion from 1773 to 1775.
Step-by-step explanation:
The Cossack rebel against Catherine the Great was c. Pugachev. Pugachev led a major uprising known as Pugachev's Rebellion from 1773 to 1775. He claimed to be the rightful heir to the Russian throne and rallied thousands of disenchanted Cossacks, peasants, and other groups against Catherine the Great's rule. The Cossack rebel against Catherine the Great was led by Emelian Pugachev. The Pugachev Rebellion, also known as the Cossack Uprising, occurred from 1773 to 1775 during Catherine the Great's reign. Pugachev, a Don Cossack, claimed to be Catherine's deceased husband, Peter III, and rallied discontented Cossacks, peasants, and various groups against the oppressive conditions they faced. Pugachev's forces captured significant territories, posing a serious threat to the Russian Empire. However, Catherine's government eventually suppressed the rebellion. Pugachev was captured, tortured, and executed in 1775. The event highlighted social unrest and the challenges of governance during Catherine's rule.