Alexander the Great is one of those rare figures in world history who genuinely deserves the accolades given by the “Great Man Theory” of history. From his base in Greece, he conquered most of Eurasia in just a few years, extending the reach of Hellenistic (Greek) culture and thought which already dominated the Mediterranean.
Yet his empire died with him in 323 BCE. An empire that large simply could not last at that time, at least without intense leadership and the sharp edge of a sword.
Fast forward a mere three hundred years, and Eurasia was dominated by four great, permanent empires which included as much as three quarters of the 300 million or so people on this planet. They were largely at peace with each other, too. What happened? What made this possible? More to the point, what can we learn from this incredible change in how people were organized and lived their everyday lives?