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). Source: Wikipedia (en)