This is used when you are founding your own kingdom. Right to rule is the amount of “respect” points you have.
If he agrees and says something about a truce, you will gain right to rule, but at the next dialogue option you can choose the second option then repeat first step. Sometimes you can gain infinite right to rule through a glitch by going to the leader of a faction you are at war with and asking to make peace. How do I increase my right to rule in Mount and Blade Warband?
