The Mongol Empire of the Middle Ages may be referred to as the Yuan dynasty when it is considered as an era in Chinese history. It was the first time foreigners ruled China. Ghengis Khan conquered China and his grandson, Kublai Khan, was the first emperor of the Yuan dynasty. The Yuan dynasty lasted from 1279 to 1368 and was succeeded by the Ming dynasty. The last emperor of this dynasty, Togon-temür, was treated by traditional historians as the classic example of an immoral final emperor who provokes heaven to revoke a dynasty's mandate. His government issued unbacked paper until paper money became worthless. The Chinese soured on paper money as a result and accepted only copper and silver coins for centuries afterwards.
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