Originally composed in Latin by Gilbertus Anglicus (Gilbert the Englishman), his Compendium of Medicine was a primary text of the medical revolution in thirteenth-century Europe. In the fifteenth century it was translated into Middle English to accommodate a widening audience for learning and medical “secrets”. This is a critical edition of the Middle English text, with an extensive introduction to the learned, practical, and social components of medieval medicine and a summary of the text in modern English.