Is there an authority on mattress size naming standards to whom I may offer a suggestion? Having just read Julian by Gore Vidal, I learned that a few centuries after Caesar and Augustus, the title of Caesar ranked below that of Augustus (well played, Gaius Octavius). I suggest King->Caesar->Augustus.
However if we want to get into semantics, the word King descends from the word Caesar. Perhaps replace King with Minister, and Queen with Representative?