Spruce said:example = the king of France grants a dukal title "duke of Flanders" to the count of Brugge. Granting that kind of title should only be allowed in their "core fief" - linking up the already present vassals to that title. So the count of Ypres will become vassal to the duke of Flanders - formerly know as the count of Brugge.
other example = the duke of Flanders inherits a rich fief in Italy. Should it be forbidden to move his capital? I don't know?
So basicly there are 2 questions =
1) do we implement the requirement for vassals to hold a count title in the area of the granted dukal title?
This sounds good, but one things occurs to me that I've seen in game.
You become a King. You get as a vassal a couple of dukes that between them own all four of the provinces in a third duchy, say two provinces each, each held by count vassals of these dukes. You can claim that third duchy since your vassals control all of its territory.
With the suggested change though, you could not then ever hand out that title, well, unless you revoked a horde of titles...
So, if we do allow this kind of change, and it does seem to make sense, perhaps we should also allow a King to give titles to his vassals' vassals.