Among the most intricate historical and religious mysteries of medieval Europe are those posed by the "Great
Heresy"--the sudden rise and spread of medieval dualism that represented the doctrine that cosmos and man
are constant battlegrounds between the forces of good and evil and their supernatural protagonists. This fascinating
book offers the first comprehensive history of religious dualism, from its early expressions in late Egyptian religion
and the revelations of Zoroaster through the Dead Sea Scrolls, the Mithraic Mysteries, and the Great Gnostic teachers
to its revival in medieval Europe and the suppression of the Bogomils and Cathars who were seen as heirs to that
ancient rival of Christianity, Manichaeism. Exploring crucial stages in the history of Christian dualist heresy,
Yuri Stoyanov illuminates a variety of religious and political undercurrents that lie beneath the surface of recorded
history.