A world, where Holy Roman Empire evolved into all-europe Warhammer-like caesaropapist "Empire of Catholics" (where Emperor was also a Roman Pope), contending with the Ottoman Sunni Caliphate, Shia Persian Empire, Orthodox Third-Rome-in-Moscow, Great Manchu China, and, maybe, Protestant Northren Leage of Britain and Scandinavia (and PuritanTheocracy in Northern America, of course).