Ujm, to use a britishism, how come you are so keen on royalty rules? Is it because of my idea expressed above, that malchusa de’ara etc..?
There is a limit, as the rambam in shemoneh perakim lists 5 levels of dibbur, the last being devorim assurim, and the 4th being “devorim nim’asim,” in which he includes “how such and such king os noheg in his palace”