The origin of Manichaeism is related to [[Zoroastrianism]]. That is why Bogomilism is sometimes indirectly connected to Zoroastrianism by affinity in the sense of its duality. The existence of older Christian heresies in the Bulgarian lands (Manichaeism and Paulicianism), which were considered very dualistic, undoubtedly influenced the development of the Bogomil movement with initial stirrings of thought toward forming another dualistic heretical doctrine near the end of the ninth century.
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The origin of Manichaeism is related to [[Zoroastrianism]]. That is why Bogomilism is sometimes indirectly connected to Zoroastrianism by affinity in the sense of its duality. The existence in the Bulgarian lands of older Christian heresies which were considered very dualistic (Manichaeism and Paulicianism) undoubtedly influenced the development of the Bogomil movement, with initial stirrings of thought toward forming another dualistic heretical doctrine near the end of the ninth century.