In the twilight of the Western Roman Empire in the 5th–6th centuries, the elite of the field armies was the heavy armoured cavalry – the cataphracts, clad in lamellar, scale, mail and padded fabric armour. After the fall of the West, the Greek-speaking Eastern or Byzantine Empire survived for nearly a thousand years, and cavalry remained predominant in its armies, with the heaviest armoured regiments continuing to provide the ultimate shock-force in battle. Accounts from Muslim chroniclers show that the ironclad cataphract on his armoured horse was an awe-­inspiring enemy: ‘...they advanced against you, iron­-covered – one would have said that they advanced on horses which seemed to have no legs’.This up-to-date study, replete with stunning full-colour illustrations of the various units, offers an engaging insight into the fearsome heavy cavalry units that battled against the enemies of Rome’s Eastern Empire.