Peter of Spain (author)

Peter of Spain (Latin: Petrus Hispanus; Portuguese and Spanish: Pedro Hispano; fl. 13th 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 Portuguese scholar and ecclesiastic Peter Juliani, who was elected Pope John XXI in 1276. 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).

The author of the Tractatus is assumed to have studied under John Pagus.

There are a large volume of manuscripts and printed editions of the Summulae Logicales, indicative of its great success throughout European universities well into the seventeenth century. Peter of Spain supported an investigation of teaching at the University of Paris which resulted in the Parisian bishop's Condemnation of 1277, which denounced Aristotelian propositions which conflicted with church doctrine.

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