So apparently there are positions in the game that are absolutely immune to all and any players' actions.
If you are a duke and a governor of a city and a royal, but not a king, there is literally no way to remove you from this position.
This leads to a situation when a player gone rogue can really harm the realm in an ugly way and nothing can be done about that.
I do not understand why it is done this way and why it makes sense. There should be no 100% immune offices, especially this powerful.
It may not be ideal from a gaming perspective, but strikes me as historically accurate. Traditionally a King's greatest obstacles were the intransigence of his dukes