Byzantine medical treatise of the 11th - 14th centuries - a monument of Byzantine culture, allowing the modern reader to appreciate the rather high level of development of medicine in medieval Byzantium. The medicine book is compiled by a practicing doctor and contains interesting examples of both professional medical techniques (for example, the use of anesthesia in the operation of patients) and original recipes of traditional medicine. A lot of valuable contains this source and to clarify some little-studied aspects of Byzantine life.