For those playing at home:

A little while ago I returned to my special interest of the Huns under Attila. This lead me back to another recurring special interest resurgence about the later Mongol Empire. And this led me right back to Prester John, because it's very likely one of the myriad Asian monarchs who European crusaders playing international medieval telephone conflated with the mytical Prester John was, in actuality, Genghis himself.