Getting rid of my own client ruler

[MerlinusCDXX]

when i need to be rid of a client ruler, I find that they suddenly get the desire to "be all that you can be" (find your future in the aaarmy, as an 'army of one'). they have this inexplicable desire to besiege that neighboring town with a full stack defending all by their lonesomes (for the glory of their hometown, of course, all of a sudden, that neighboring town must be annexed to the "kingdom of west bumf**k"). poor dears always end up getting killed though...tragic it is