This book presents an edition of the Questiones super libro De Animalibus Aristotelis, a work by one of the greatest philosophers and physicians of the 13th century, Peter of Spain (later Pope John XXI, 1205-1277). He took as the basis for his work the translation from the Arabic made in Toledo around 1220 by Michael Scotus which included three important Aristotelian treatises. Preceding the critical edition, Dr Navarro offers an introduction to the person and works of Peter of Spain, the intellectual context of the 13th century characterized by Scholasticism and an Aristotelian Renaissance,...