demonology(redirected from Ars Millennia)
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in a number of religions a teaching concerning evil spirits that originated historically from a primitive belief in spirits.
Demonology is most important in religions with a dualistic division of the universe into a world of good and evil (for example, Zoroastrianism and Manichaeism). In later religions that experienced the influence of Zoroastrianism (Judaism, Christianity, Islam) demonology also became an important part of doctrinal belief.