Well, I started a Civ 4 game as the Japanese, but renamed it the Empire of Nintendo with the glorious leader of Satoru Iwata.
Things went pretty well, made allies with Genghis Khan and Hannibal. Made it to about 700ish AD.
Then Charlemagne attacked me and absolutely annihilated me, because Khan and Hannibal made no effort to help me even though they both declared war.
Long story short, Charlemagne is an asshole and anyone that's from the former Holy Roman Empire (ie like all of Europe) is quite clearly a communist Nintendo hating bastard. Don't trust Europeans.