Avvakum was a 17th-century Russian priest and a prominent leader of the Old Believers. Born in Grigorovo, he became a central figure in the opposition against the liturgical reforms introduced by Patriarch Nikon. His refusal to accept these changes, which aimed to align Russian practices with Greek traditions, led to repeated imprisonments and eventual exile. He is widely celebrated as a significant literary figure due to his autobiography, which is regarded as a masterpiece of Russian literature for its unique blend of sacred and vernacular language.