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Here is the trailer for the BBC documentary. It asks the question, "How did a man born in the depths of Asia build an army and an empire that spanned the world? This was the first era of global history and the peace that Genghis Khan ushered in along the Silk Road was a model. He is remembered as a genius in war, but he promoted trade, and the empire was about business. The safety of travel and the code of laws was a hallmark of empire. Even Marco Polo could not have traveled to the court of the Chinese emperor Khubilai Khan had his grandfather not created the peace.