Rashid-al-Din Hamadani
According to Rashid-al-Din Hamadani (1247–1318), Genghis Khan's eldest son, Jochi, had nearly 40 sons, of whom he named 14. When he died, they inherited their father's dominions as fiefs under the rule of their brothers, Batu Khan, as supreme khan and Orda Khan, who, although the elder of the two, agreed that Batu enjoyed primacy as the Khan of the Golden Horde ("Jochid Ulus").