Peter IV of Aragon (1319-1387), king of Aragon (1336-1387), the Ceremonious or el del punyalet (the one of the little dagger). He deposed the James III of Majorca and rejoined the Balearic Islands and Roussillon under the crown of Aragon. He wrote the Chronicle of his name.

Throughout his reign, Peter IV had frequent conflicts with the inquisitor general of Aragon, Nicolas Eymeric