Count Mikhail Nikolayevich Muravyov (Михаи́л Никола́евич Муравьёв; 1796-1866) was a Russian imperial statesmаn of the 19th century, most known for his putting down Polish uprisings, and subsequent cultural and social depolonization of Northwestern Krai (today's Belarus and Lithuania). He should not be confused with his grandson, Mikhail Nikolayevich Muravyov, who served as Russian Foreign Minister between 1897 and 1900.
During his years at the University of Moscow, Muravyov set up the Mathematical Society, of which he would later become president. He volunteered during the Patriotic War of 1812 and was wounded at Borodino. In 1816 he became a co-founder of the first Decembrist societies, and, although he didn't actively participate in the movement after 1820, he was briefly apprehended by the police after their failed uprising in December, in 1825.
Upon the intercession of his high-placed relatives, Muravyov was appointed Vice-Governor of Vitebsk in 1826, and appointed Governor of Mogilyov in 1828. At these posts, he became known for his harsh policy of Russification. He instituted a complete ban on the Latin alphabet and the Lithuanian language in printed content. The ban was lifted in 1904.
Muravyov's experiences during the November Uprising of 1830 persuaded him that two principal agents responsible for the spread of the Polish nationalism were the Roman Catholic priests and Polish students. As a consequence, he made it his priority to close the Vilnius University and to expel Catholic priests from other educational facilities. He was reported as saying that, "What Russian rifle did not succeed in doing, will be finished off by Russian schools."
In 1831 Muravyov governed Grodno, only to be moved to Minsk the following year. In 1850, he was made a member of the State Council of the Russian Empire. In the 1850s he served as Vice-President of the Russian Geographical Society. Alexander II appointed him Minister of State Properties, a position which Muravyov used to lead the reactionary party opposed to the emancipation of the serfs. His administration of state-owned peasant households proved catastrophic and effectively reduced many of them to bankruptcy.
Northwestern Krai Governor General
During the Polish-Lithuanian January Uprising of 1863, Muravyov was appointed Governor General of Northwestern Krai (former Grand Duchy of Lithuania, now Lithuania and part of Belarus). He managed to promptly subdue the rebellion. About 9000 insurgents were resettled to Siberia, 127 were demonstratively hanged. Konstanty Kalinowski, Zygmunt Sierakowski and Antanas Mackevičius were amongst the rebel leaders executed on his orders. Those settlements where the rebels were reported had to pay enormous contributions. As a consequence, for Poles and liberal Russian circles Muravyov became known as the "hangman of Vilnius"  even in modern Polish historiography he is sometimes referred to by his contemporary nickname, 'Wieszatiel' (russified Polish for 'hangman'). To many nationally minded Russians, Muravyov was a hero and the de facto head of the "Russian Party". They flooded Muravyov with congratulatory telegrams on his nameday, November 8, 1863, a form of public expression previously unknown in Russia .
After defeating the rebels militarily, Muravyov began a series of deep reforms which aimed at the liquidation of the breeding grounds for future uprisings. He strengthened the economic, educational and social positions of Orthodox peasant Belarusians who made up the majority of the Krai's population and predominantly haven't supported the uprising due to their previously underprivileged status under Polish Szlachta. He paid much attention to the restoration of the Orthodox character of Belarus since he regarded this as the best mean against potential illoyalty and because he was convinced that he liberates ancient Russian (Rus') lands from Polish subjugation.
On May 1, 1865 Muravyov was relieved from his duties. For his vital services to the Empire, he received a comital title and spent late 1865 and early 1866 writing his memoirs. At the time of his death Muravyov was investigating Dmitry Karakozov's attempt to assassinate the tsar.
In the long term, Muravyov's policy proved mixed. In 1905 Polish rebellion once again took place against Russian Empire. He was however instrumental in rooting out Roman Catholicism in Belarus, prohibiting construction of new churches and converting the existing ones to Eastern Orthodox chapels. Muravyov justified his russification policies by claiming that Polish and Lithuanian administration undertook polonization measures.
Assessment of Muravyov's activity by the educated strata of the Russian society varied from enraptured odes by Fyodor Tyutchev to caustic satires by Nikolai Nekrasov. After the suppression of the 1863 uprising, the celebrated emigre writer Alexander Herzen, whose influence on the Russian public opinion had been fatally damaged by his support for the rebels, bitterly joked that Muravyov should replace Alexander II on the throne as a more consistent and forceful nationalist. In Poland and Lithuania he has been viewed as a personification of tsarist repression and Russification.
- ^ See A.N. Mosolov, "Vilenskie ocherki", in Russkaia starina no. 11, 1883, p. 405. quoted in Mikhail Dolbilov, "We are at one with our tsar who serves the Fatherland as we do: The Civic Identity of Russifying Officials in the Empire's Northwestern Region after 1863" 
- Adam Bruno Ulam, Prophets and conspirators in prerevolutionary Russia, Transaction Publishers, 1998, Google Print: p.8
- (Polish) Muravyov Diaries, scan of first Polish edition, 1916