Mongol invasions of the Levant to Genghis Khan was his son Ögedei, but the leadership was then taken by force by the descendants of Genghis' son Tolui. During the reign of Kublai Khan (son of Genghis' son Tolui), descendants of Genghis's other sons Ögedei, Chagatai, and Jochi sought to oppose the rule of Kublai. The Ilkhanate had been founded by Hulagu, another of Tolui's sons, who was therefore loyal to Kublai. The Golden Horde had been founded by Genghis' son Jochi, following the Mongol invasion of Central Asia. Genghis had designated several of the territories south of the Caucasus to Jochi, specifically Georgia, and the
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