I have been playing Warband native and its mods since Bannerlord's release and yes this does happened all the time. Its a wonder why its not already in Bannerlord. If the Nords got too much territory then about 3 faction would start to declare war on them this would crush the snowballing faction.If i remember correctly warband had a system like this no (or was it in diplomacy)? When a kingdom started to get too strong 2 or 3 others would declare war on it basically at the same time to "curb that threatening realm's power" in a sense that it had became a threat to the geopolitics of Calradia so everyone banded together to stop it and restore balance.