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The Medieval Church · 11th century; attribution debated
On the Operation of Daemons
Michael Psellos · 1018–c. 1078
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What it is
A dialogue classifying demons by the element they inhabit, reporting the practices of a heretical sect, and treating some possession as physical illness.
Why it lasted
Widely read in the Renaissance as an authority on demonology, and an early instance of distinguishing madness from possession.
Where to read it
Public domain and free to read in full, though not held here. The archives below have it.
These open a search on each archive rather than a direct link, which is the honest way to point at an edition nobody here has checked line by line.
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