After the Tang dynasty, non-Han Chinese empires gained prestige by connecting themselves with China; the Khitan Gurkans used the title of "Chinese emperor", and the empire was also called the "Khan of Chīn". The Qara Khitai used the "image of China" to legitimize their rule to the Central Asians. The Chinese emperor, together with the rulers of the Turks, Arabs, India and the Byzantine Romans, were known to Islamic writers as the world's "five great kings". Qara Khitai kept the trappings of a Chinese state, such as Chinese coins, Chinese imperial titles, the Chinese writing system, tablets, seals, and used Chinese products like porcelein, mirrors, jade and other Chinese customs. The adherence to Liao Chinese traditions has been suggested as a reason why the Qara Khitai did not convert to Islam. Despite the Chinese trappings, there were comparatively few Han Chinese among the population of the Qara Khitai. These Han Chinese had lived in Kedun during the Liao dynasty, and in 1124 migrated with the Khitans under Yelü Dashi along with other people of Kedun, such as the Bohai, Jurchen, and Mongol tribes, as well as other Khitans in addition to the Xiao consort clan.