Devil's Horsemen

In the fifth century, Attila the Hun terrorised both the Eastern and Western Roman Empires; his were the first of the Devil’s horsemen. After his death his empire quickly disintegrated – but then came the Magyars, fighting the early Holy Roman Empire, and the heavy cavalry used to counter them is where the concept of the knight in armour comes from. Thirdly, there are the Turks, the only group tha...