Sources for the reconstruction of Slavic mythology. Organization and forms of Old Slavic cults (sacrifice and idolatry). Setting thesis on “high” and “low” mythology. Doubts about the nature of the supreme Slavic deity (Slavic “dis pater” between the dark, uranium and solar principle). Reconstruction of the Slavic pantheon and catalog of Slavic deities. Pagan-Christian syncretism: Christian saints as substitutes of Slavic deities.