Who Was the Greatest Conqueror in History — Caesar, Alexander, Napoleon or Genghis Khan?

History has produced a handful of military leaders so dominant they reshaped the entire known world. Alexander the Great never lost a battle and conquered from Greece to India by age 32. Julius Caesar transformed Rome from a republic to the foundation of an empire. Napoleon conquered most of Europe in a decade and reformed the legal systems of nations. Genghis Khan built the largest contiguous empire ever seen, from China to Eastern Europe. Each redrew the map of their world. Who was the single greatest conqueror in all of human history?

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