The nomads of central Asia during the thirteenth century returned to center stage in world history. The Mongols ended or interrupted the great postclassical empires while extending the world network of that era. Led by Chinggis Khan and his successors, they brought central Asia, China, Persia, Tibet, Iraq, Asia Minor, and southern Russia under their control. The states formed dominated most of Asia for one and a half centuries. The Mongol success was the most formidable nomadic challenge to the global dominance of the sedentary, civilized core civilizations since the first century C.E. The Mongols often are portrayed as barbarian, destructive…