Mongol conquest of Western Xia Mongol conquest of Western Xia The Mongol conquest of Western Xia was a series of conflicts between the Mongol Empire and the Western Xia (Xi Xia) dynasty, also known as the Tangut Empire. Hoping to gain both plunder and a powerful vassal state, Mongol leader Genghis Khan commanded some initial raids against Western Xia before launching a full-scale invasion in 1209. This marked both the first major invasion conducted by Genghis and the beginning of the Mongol invasion of China. Despite a major set-back during a nearly year-long siege of the capital, Yinchuan, when the diverted river accidentally flooded their
Society of the Mongol Empire when the Song dynasty started replacing their copper coinage with paper currency. When the Mongols invaded Song China they started issuing their own Mongolian bills in 1227. This first attempt by the Mongols did not last long because the notes issued expired after several years and were inconsistent throughout the parts of the Mongol Empire that issued them. In 1260, Kublai Khan created the Yuan Mongol's first unified paper currency with notes that did not have any expiration date. To validate the currency, it was made fully exchangeable to silver and gold and was accepted as tax payments. Currency distribution