And in case you were wondering, Mongols are kings of imperial.
So Mongols are kings of imperial. Persians, Koreans, and Turks are emperors of imperial.
Very nice said.
I thought about adding Teutons (my favorite civ) on that list, but I think in a match-up against Mongols they would have a disadvantage given by their slow units so I didn't mentioned them. Spanish could also be there among kings and to some point even Goths (although they have a lot of minuses).