Yemelyan Pugachev
Yemelyan Ivanovich Pugachev () (c. 1742 – ) was a Russian Cossack who led a great popular insurrection during the reign of Catherine the Great, claiming to be her late husband, Emperor Peter III. Alexander Pushkin wrote a notable history of the rebellion, "The History of Pugachev", and he recounted some of the events in his novel "The Captain's Daughter" (1836).
Nağaybäk
In 1773 Nagaybak Fort was caught in the way of Yemelyan Pugachev's rebellion. Loyal cossacks and troops, headed by captain Rushinsky, fled to Menzelinsk; most of the remaining soldiers joined the rebellion and participated in the siege of Ufa. Pugachev installed a "newly baptized Persian" by the name of Tornov, as the ataman of Nagaybak. In January 1774 a small government company pushed the rebels out of Nagaybak Fort, but Tornov returned in strength and regained control over the fort. Two weeks later a whole corps of government troops crushed the rebellion. The fort became a base for punitive expeditions against the remains of Pugachev's army.