Il castello di Eymerich ("Emerych's Castle") is a book written by Valerio Evangelisti, an Italian historian and writer of historical fantasy. In chronological order, it is the seventh book in a best-selling series whose central character is Nicholas Eymerich, an inquisitor of the Spanish Inquisition - a historical character, whom Evangelisti adopted to his novels following a detailed research of sources concerning Emerych's figure. It has been translated into many languages, most notably German, French, Spanish and Portuguese. Source: Wikipedia (en)