In a lot of forum threads there are a lot of talks about the fact that being an Emperor is not simply be more that a King and that that more flavor should be added. In particular in the Christian world be an Emperor gave to you a sort of sacral aura, the coronation of the Holy Roman Emperor was similar to the creation by the Pope of a Cardinal. It is for this that the Emperor had, in the middle ages these prerogatives: - A sacral aura of sort that gives to him the authority to guide all the Christendom - The fact that his should elect the Pope because The Emperor is indeed a Cardinal! - There should be only one Empire in the west, the successor state of the Western Roman Empire is only one! Regarding the third point this do not implicate that this mod will remove ahistorical Empires because for the developer(s) point of view, they, indeed existed at least the ones in Western Europe: they are, indeed, the remnant of the Roman Prefectures but Christians will be simply Kings