Sitting Bull. REXes like madly, has City Defending Longbows of Doom and is not trading anything useful (partly because he is backwards...)
Mansa Musa on another continent. The alien from planet Sury. And Justinian. Founds a religion, spreads it, gets some allies, rexes, and techs quite well. And the RNG decides to throw him in each second game. He's an jack-of-all-trades, and a lategame specialist somewhat (I still remember the Prince OCC where he suddenly founded some corps, teched like a madman and exterminated Shaka within 5 turns, I won via Spaceship with a giant byzantine Stack o' Doom at my very doorstep... phew...