Cao Zhang had yellow hair inherited from his mother. High percentage of post-Han Chinese and nomadic aristocrats described as yellow-haired sons or blue-eyed sons. Northern and southern Jin aristocrats included blondes. Xianbei tribe entirely white-skinned with yellow hair. Emperor Ming of Jin had yellow beard from Xianbei mother and was called yellow-bearded Xianbei slave. Non-Han invaders like Xianbei, Khitan, Jurchen mixed into Chinese aristocracy. Imperial harems included Central Asian tribute women. Foreign-looking princes viewed as divine due to unique appearance. Blonde hair recessive but appears via maternal line. Genghis Khan possibly red-haired. Tocharian and Indo-European contacts introduced blond genes to China. Sun Quan had purple hair possibly from such contacts. Blonde emperors would face gossip about demonic paternity but rule if legitimate. Chinese feared blond Westerners as ghosts or pirates.