Task: Question Generation
Input (English): As a result, by 1206 Temüjin had managed to unite or subdue the Merkits, Naimans, Mongols, Keraites, Tatars, Uyghurs, and other disparate smaller tribes under his rule. It was a monumental feat for the "Mongols" (as they became known collectively). At a Khuruldai, a council of Mongol chiefs, Temüjin was acknowledged as "Khan" of the consolidated tribes and took the new title "Genghis Khan". The title Khagan was not conferred on Genghis until after his death, when his son and successor, Ögedei, took the title for himself and extended it posthumously to his father (as he was also to be posthumously declared the founder of the Yuan dynasty). This unification of all confederations by Genghis Khan established peace between previously warring tribes and a single political and military force under Genghis Khan.
Output (English): Who gave Genghis Khan the title Khadan?