Also, an option if one wants to have greater customization with lesser confusion, distinctive markers could be had for each title. In the military, for example, each rank has its own symbol. IG, it could be a color-code and/or icon.
What about real life military symbols. Star for a general, Chevron with one bar for a Marshal, Chevron with no bar for a vice Marshal.
Also the message section could be made to clear it up. When you're in an army instead of saying "Marshal of Army X" it could say "Your Commanding Officer", just like for lords it says "your liege".
