Bumped to note Diplomatic Victory in the Rise of the Sun conquest in April 1515.
I have two conquests left. (Rise of Rome and Middle Ages)
I'm currently playing the Middle Ages as the Turks. I don't see any peaceful victory condition on this one [Abbibs would take 1200 turns to reach 30K, only 208 turns in the game], so I guess I will evenually be attacking someone!