Peter of Spain
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This article is about the 13th-century logician and author of medical works. For the Dominican friar, see Petrus Ferrandi Hispanus. For information on the pope often identified with the author, see Pope John XXI.
Peter of Hispania (Latin: Petrus Hispanus; Portuguese and Spanish: Pedro Hispano; fl.ā13th century) was the author of the Tractatus, later known as the Summulae Logicales, an important medieval university textbook on Aristotelian logic. As the Latin Hispania was considered to include the entire Iberian Peninsula, he is traditionally and usually identified with the medieval Portuguese scholar and ecclesiastic Peter Juliani, who was elected Pope John XXI in 1276.[1][2] The identification is sometimes disputed, usually by Spanish authors, who claim the author of the Tractatus was a Castilian Blackfriar. He is also sometimes identified as Petrus Ferrandi Hispanus (d. 1254 x 1259).