I finally accomplished taking John I from England to 9: Tibet in Genghis Khan II with five successors to the throne. He is the most inept ruler in the game and it's very challenging, having England take Tibet creates a perfect blend of cultures and army units at the location of the roughest terrain to invade because of how many days it takes to reach the castle and makes raids unsuccessful because of the days it takes to retreat with plunder. Right now I'm just doing domestic tasks to make the population and its support of the ruler grow in a mountain fortress. The war stage is over for now and I wanted European culture in Asia with successors when the ruler dies.