In the 14th century, the kings of Aragon in NE Spain governed threee countries that were politically & linguistically distinct, & were linked only by the rule of their common monarch: the principality of Catalonia, the kingdom of Aragon, & the kingdom of Valencia. These realms--which we may call collectively the “Crown of Aragon,” to distinguish them from the kingdom of Aragon proper--have left abundant archival materials. Among the subjects that have recently received scholarly attention, the regulation, availability, & delivery of health care in these lands are proving to be of unusual historical interest. This study focuses on the development of medical regulation in the kingdom of Valencia, but in the process it also illuminates the same topic with regard to the wider society of the Crown of Aragon &, indeed, of late-medieval Europe. Illus.