The book is dedicated to the army of the Byzantine Empire, which for many centuries was one of the most powerful states of the Middle Ages and had a strong influence on the fate of peoples in Europe, Asia and Africa. The heiress and keeper of ancient military traditions, the Byzantine army, at the same time, was not some kind of frozen structure incapable of evolution. Borrowing from its opponents all the best technical and tactical achievements, the army of the Empire was formed as a product of a harmonious synthesis of Greco-Roman and alien elements. To show the reader the most complete picture of what the army of the Empire was, the authors highlight issues related to the recruitment of the army, its weapons, tactical division, combat techniques, and many others. The book is addressed to both specialists and all those interested in the military affairs of Antiquity and the Middle Ages.