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
Mongol Empire which carved through the Altai mountains. After his enthronement, Ögedei further expanded the road system, ordering the Chagatai Khanate and Golden Horde to link up roads in western parts of the Mongol Empire. Kublai Khan, founder of the Yuan dynasty, built special relays for high officials, as well as ordinary relays, that had hostels. During Kublai's reign, the Yuan communication system consisted of some 1,400 postal stations, which used 50,000 horses, 8,400 oxen, 6,700 mules, 4,000 carts, and 6,000 boats. In Manchuria and southern Siberia, the Mongols still used dogsled relays for the yam. In the Ilkhanate, Ghazan restored the