Christianization of Bulgaria From Wikipedia, the free encyclopedia The Christianization of Bulgaria was the process of converting 9th-century medieval Bulgaria to Christianity. Contents   1.1 Initial setbacks 1 Background 2 Byzantine demand 3 Reasons for the Christianization 4 Reaction 5 Choice between Orthodoxy and Roman Catholicism 6 Result 7 See also 8 Notes 9 References    Background When Khan Boris began ...