Who is Genghis Khan from Time's Eye and what is their importance?

A man of about sixty, Genghis Khan is not tall, but he is a commanding presence as an Emperor. He is of slim build, and fit stature, with a full and very Asiatic style face. There is only a trace of grey in his hair, and he sports a neatly trimmed beard. His eyes resemble those of a cat—black and unreadable. He is a violent and unsympathetic man who has little tolerance or use for weakness. Intent on world domination, he marches his army to Babylon, slaughtering all in his path on the way. A cruel and evil man, he rules by fear instead of by respect and love, and keeps his armies and tribes well mixed so that the only loyalties anyone is able to establish is to him.