Definition: In this task, you will be presented with a text and a pronoun. You should write the name that the pronoun refers to. Position of the pronoun in the text is showed within two "_"s.
Input: Their daughters were also given husbands of tribes important to the expansion of the Mongol Empire and they were expected to aid their father by taking over power their while their husbands served him as his gurugen, or sons-in-law. The Uyghurs were enemies of the Western Liao and their chieftain requested a marriage alliance with Genghis Khan, hoping to become a 'fifth son' to _him_. <sep>, Pronoun: him

Genghis Khan