Reprint of editions 1913-1916 Galkovsky's work became a notable phenomenon in the history of the study of the East Slavic pagan tradition, as well as the transition period from paganism to Christianity in Ancient Russia. The author begins his research with an essay on the pagan religion of the Eastern Slavs. Further, Galkovsky goes on to study the history of the struggle of Christianity against idolatry and various remnants of the pagan religion - freedom of sexual relations, the cult of ancestors, witchcraft, witchcraft, superstition and others. The second volume of Galkovsky's work contains texts of Old Russian teachings directed against the remnants of paganism among the people.