Skeptical demonology and early psychiatry

Johann Weyer (Johannes Wierus)

1515 – 1588

Johann Weyer was a Dutch physician and student of Agrippa who became an early defender of those accused of witchcraft, arguing in De Praestigiis Daemonum (1563) that accused witches were mentally ill — suffering from melancholic delusion — rather than genuine diabolic agents, and deserved medical treatment rather than execution. His Pseudomonarchia Daemonum (appended to later editions), a catalog of demonic hierarchy, paradoxically reinforced demonological literature while undermining the theological basis for witch-trial persecution. As both a skeptic of witch-trial justice and a contributor to the demonological canon, Weyer occupies a unique position at the intersection of rational medicine and occult taxonomy.