This week's heresy is a branch of Gnosticism, from which one of the heresies we already covered (Albigensism) comes.
Bogomilism is a heresy of the Gnosticism branch founded in the First Bulgarian Empire, and was formed as a political movement in opposition to both the Bulgarian church and state. Bogomils called for a return to early Christianity by rejecting church hierarchy and resisting both church and state authorities. Bogomils were dualists, believing the world was not created by God but by the Devil (the spiritual realm was good and governed by God, the material world was sinful and governed by Satan). They eschewed icons and buildings, preferring the outdoors for worship. Bosnianism was a localized sect of Bogomilism. They were believed to be influenced by Euchitism. Bogomilism was accused of being a Neo-Manichaean (Manichaeism) movement.