The Roman Republic was one of the most remarkable achievements in the history of civilization. After its founding in 509 BCE, Rome grew from an unremarkable Italian city-state to the dominant superpower of the Mediterranean world. Through it all, the Romans never allowed a single man to seize control of the state. Every year for four hundred years the annually elected consuls voluntarily handed power to their successors. Not once did a consul give in to the temptation to grab absolute power and refuse to let it go. It was a run of political self-denial unmatched in the history of the world. The disciplined Roman republicans then proceeded to explode out of Italy and conquer a world filled with petty tyrants, barbarian chieftains, and despotic kings. But the very success of the Republic proved to be its undoing. The republican system was unable to cope with the vast empire Rome ruled. Bankrolled by mountains of imperial wealth and without a foreign enemy to keep them united, ambitious Roman leaders began ...