Bernard Gui, also known as Bernardo Gui or Bernardus Guidonis, was a Limousin Dominican friar, Bishop of Lodève, and a papal inquisitor during the later stages of the Medieval Inquisition.
14th-century illustration of Gui receiving a blessing from Pope John XXII
Practica officii inquisitionis heretice pravitatis, manuscript, 14th century. Toulouse, Bibliothèque d'Etude et du Patrimoine, Fonds Manuscrits, Ms 388.