The ont declaring is always the leader of the faction, no matter is some random count calls in a huge empire to assist them, you will have to deal with that count for peace.
This can sometimes be exploited when a weak faction declares war on you and call in their big brother allies - just blitz the faction declaring and reach about 50% warscore despite losses - at which point they will most likely accept a white peace.
This can sometimes be exploited when a weak faction declares war on you and call in their big brother allies - just blitz the faction declaring and reach about 50% warscore despite losses - at which point they will most likely accept a white peace.