The Secret History of the Mongol Queens The Secret History of the Mongol Queens The Secret History of the Mongol Queens: How the Daughters of Genghis Khan Rescued His Empire is a 2010 book by Jack Weatherford, about the impact and legacy of Genghis Khan's daughters and Mongol queens such as Mandukhai the Wise and Khutulun. The book references Mongolian, Central Asian, Persian, European and Chinese sources such as "Altan Tobchi", "Erdeni Tobchi", "Erdenyin Tunamal Sudar", "Tarikh-i-Rashidi", "Tarikh-i Jahangushay-i Juvaini", and "Ming shi" in addition to various secondary sources in English, Mongolian, and German. Weatherford also analyzes the role of Mongol women in the Mongol Empire and
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