The kings had been perfect for some time. Sixteen generations of careful crossbreeding had eliminated the buffoonery, the greed, the inappropriate jokes, the baldness, and of course the women. The perfect king (noble, good looking, able to wave for hours without tiring) had been formed two centuries ago, and cloned ever since.
But now the problem was the cloning process. The flawless unchanging DNA left each new king prone to disease. New bacterial strains, new fungal infections. With unaltering genetics, no clone could develop resistance. The royal line of perfect kings was starting to fail.