Muravyov was promoted in rank to major-general in 1841, but had to permanently retire from the military due to illness. He transferred to the Ministry of Internal Affairs and was appointed as an acting military and civil governor of Tula province in 1846. Eager in his willingness to improve the province's state of affairs, he proposed to establish the governorate agricultural society. Muravyov was the first governor to propose Tsar Nicholas I to abolish serfdom; a motion signed by nine local land-owners. While the tsar did nothing about the petition, from then on he always referred to Muravyov as a "liberal" and a "democrat".