Searchable registers of papal letters from the 13th- and 14th-century popes, based on Registres et lettres des Papes du XIIIe siècle (32 vols.; Rome, 1883- ) and Registres et lettres des Papes du XIVe siècle (48 vols.; Rome, 1899- ). These letters provide information on many aspects of medieval society, such as church institutions, politics, government and finance, and religious, intellectual, and artistic life. Includes citations and a brief description of the contents, but no full-text. Search (or Browse) by Pope, date, letter type, place of promulgation and many other criteria.