


Bodrov said, 'The Japanese had a very famous ancient warrior who disappeared, and they think he went to Mongolia and became Genghis Khan. Speaking on the choice of Tadanobu Asano to portray Temüjin, Bodrov commented that although it might have seemed odd to cast a Japanese actor in the role, he explained that the Mongol ruler was seen by many Japanese as one of their own. Casting for the film took place worldwide, including Mongolia, China, Russia, and in Los Angeles. Author Gumilev had used the work as a historical reference and a work of significant literature. The only Mongol history from the era is The Secret History of Mongols, written for the Mongol royal family some time after Genghis Khan's death in AD 1227. He found difficulty in preparing the screenplay for the film due to the fact that no contemporary Mongol biography existed. Bodrov spent several years researching the aspects of his story, discovering that Khan was an orphan, a slave and a combatant whom everyone tried to kill.
