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).
Muhannad (jihadist)
On 1 August 2010, the rebel website Kavkaz Center posted an announcement from Dokka Umarov in which he stated he was stepping down from the top leadership position in the Caucasus Emirate and naming Aslambek Vadalov as his replacement. However, just three days later Umarov would retract his resignation, leading to confusion over who was actually in control of the North Caucasus insurgency. On 12 August, a video posted on a Russian militant website appeared featuring Muhannad, Khuseyn Gakayev, Vadalov, and Tarkhan Gaziev; in it, the four veteran field commanders alleged that Umarov's renunciation was disrespectful to his subordinates, and while they still pledged allegiance to the Caucasus Emirate, they no longer supported him. According to Muhannad, the primary reason for the mutiny was Umarov's disobedience of the mujahideen shura council's consensus that he step down; in response, Saifullah Gubdenski - leader of the Dagestani fighters - fiercely condemned Muhannad by accusing him and his foreign predecessors of "neglecting the aspirations of local rebel leaders" and lashing out at the "outsiders' selfish desire to install their men in leading positions in traditionally parochial" Caucasian militant groups. Furthermore, the vast majority of insurgents in the republics surrounding Chechnya continued to support Umarov, at one point reaching out for external theological support via the London-based Syrian Salafi ideologue named Abd al-Mun'im Mustafa Halima (also known as Abu Basir al-Tartusi), who called on Muhannad to "either repent and obey Emir Doku Abu Osman (Dokka Umarov) or leave the [North] Caucasus and return home." Umarov himself accused Muhannad of being the "main organizer of fitna (split/discord) among the Mujahideen" in Chechnya, 
and asked him to re-affirm his loyalty. When Muhannad did not, Umarov allegedly relieved him of his command, leading to a very significant break within militant ranks.