Momentarily banish thoughts of policemen on duty at the House of Commons, and picture a Roman pleb. You will probably visualise a toothless peasant howling for ‘bread and circuses’ (i.e. chariot races), and rioting if refused. But if you were then told that the Roman statesman Cicero and Caesar’s rival Pompey the Great were both plebs, you might reconsider; even more so if you were to discover that the plebs were involved in shaping some of the most dramatic events in the ancient world.