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 1825. By some sources he was cooperating with the investigation buying out his freedom this way. 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. 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
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. ==Governor General ==