 Besides these works on logic, there are other works that have been written by a Peter of Spain. In the Petrus Hispanus papa tradition, he is the supposed author of a famous medical work Thesaurus pauperum, as well as fourteen other works on medicine. Other writings by (a) Peter of Spain include a Scientia libri de anima, and commentaries on Aristotle’s De anima, De morte et vita, De sensu et sensato, De  animalibus,[3.]  and commentaries on works by pseudo-Denys the Areopagite. As yet there is no certainty about whether the Peter of Spain who wrote these treatises is the author of the Tractatus and the Syncategoreumata, or about the dates of their origin.