 No evidence exists of it being used in a modern sense in Ancient Greek, but we find it in Byzantine documents from the 6th century onwards, and most notably in the work attributed to Emperor Leo VI the Wise of Byzantium.As a counterpoint to European developments in the strategic art, the Mongol Emperor Genghis Khan provides a useful example.Genghis' successes, and those of his successors, were based on manoeuvre and terror.