Johann Weyer

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Johann Wier
Engraving of Johann Wier, age 60, from De Lamiis Liber
Born	1515 (1515) Grave, Netherlands
Died	24 February 1588(1588-02-24) (aged 73) Tecklenburg, Germany
Other names	Jan Wier, Johan Wier, Johannes Wier, Jean Wier, Ioannes Wierus, Piscinarius
Occupation(s)	Physician, general occultist
Employer	Duke of Jülich-Cleves

Johannes Wier (Latin: Ioannes Wierus or Piscinarius; 1515 – 24 February 1588) was a Dutch physician who was among the first to publish a thorough treatise against the trials and persecution of people accused of witchcraft. His most influential work is De Praestigiis Daemonum et Incantationibus ac Venificiis ('On the Illusions of the Demons and on Spells and Poisons'; 1563).