While princes do rule the empire, they have to work within certain boundaries, and they're also always in a contest with each other to become the next emperor. And this contest includes actually killing each other, doing anything they can get away with to each other.
Garth NixSam picked up his pack, but before he could put it on, Mogget leaped onto it and slid under the top flap. All that could be seen of him were his green eyes and one white-furred ear. "Remember I advised against this way," he instructed. "Wake me when whatever terrible thing is a about to happen happens, or if it appears I might get wet.
Garth Nix