I find it interesting that Manichaeism is used as a synonym for dualism despite the fact that dualistic cosmologies predate Manichaeism by at least a millennium

I find it interesting that Manichaeism is used as a synonym for dualism despite the fact that dualistic cosmologies predate Manichaeism by at least a millennium--Zoroastrianism relies heavily on dualistic cosmology, and probably exists in a similar form in the older Indo-Iranian religion that Zoroastrianism (and Hinduism, for that matter) is based on.