This was the first empire to use paper money as a currency and was visited by Marco Polo. What empire was founded by the grandson of Genghis Khan?

At its height, the Yuan Dynasty spread across more than nine percent of the Earth (5.41 million square miles) and was home to 17 percent of its population (60 million in 1291). Founded by Genghis Khan's grandson, Kublai Khan, the dynasty was the only one in China's history not founded by a native Chinese emperor. It was during Khan's reign that Marco Polo visited and that paper money became a hit.

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