(Lisboa, Portugal, c. 1226 - Viterbo, Italia, 1277)
"Juan XXI (Lisboa, c. 1215 - Viterbo, 20 de mayo de 1277), papa n.o 187 de la Iglesia católica de 1276 a 1277. De nombre Pedro Julião, y más conocido como Pedro Hispano es, hasta el momento, el único papa portugués de la historia."
"Pope John XXI (Latin: Ioannes XXI; c. 1215 - 20 May 1277), born Peter Juliani (Latin: Petrus Iulianus; Portuguese: Pedro Julião), was Pope from 8 September 1276 to his death in 1277. Apart from Damasus I (from Roman Lusitania), he has been the only Portuguese pope. He is usually identified with the logician and herbalist Peter of Spain (Latin: Petrus Hispanus; Portuguese: Pedro Hispano), which would make him the only pope to have been a physician. "Pope John XXI" was actually the 20th pope named John, but decided to skip the number XX."