Becoming a Vassel

[Bob the Insane]

I wonder if making a faction a vassel factions as destroying it for the victory conditions?

I know the vassels lands will count towards your own for victory conditions however. Or your lands will count towards the Frenches number in the instance above.

I wondoer if you win the game as a vassel (short game anyway)? If the faction you are a vassel of is not one of the ones you need to destroy...