Originally Khan was the title of Mongol rulers and commanders. During their campaigns in Asia various nations, who served in their armies, adopted it as a title.
Persians had had cultural ascendancy since Turkish hegemony, being a literary language of the East since ancient times.. Turks at various times adopted it once they started establishing empires. Humayun was reinstated by Persians and he accepted Persian influence in his court. Later Nur Jehan ...