Abstract: This chapter examines impotence magic in 13th- and 14th-century medicine. Medical discussions of impotence magic are less commonly found than those in theology and canon law, but they offer a different view of magic. The chapter discusses several 13th-century writers, including Gilbertus Anglicus, whose cures for magically-caused impotence do not seem to have come from written sources. It also examines the status of these cures as empirical remedies, which could not be explained by medieval science, and it argues that some of the empirical remedies recommended by medical writers would have been classified as magic by medieval theologians. It also describes how some medical writers offered natural explanations for how certain magical practices caused impotence. The chapter concludes with an examination of one text, the Remedies Against Magic ascribed to Constantinus Africanus or Arnold of Villanova, and discusses how its late medieval copyists approached the subject of impotence magic.

Keywords: Arnold of Villanova, Constantinus Africanus, cures, empirical remedies, Gilbertus Anglicus,