The Dead Lands of Athas
The Sorcerer Monarchs are immortal beings, masters of both psionics and magic. So powerful are these creatures, that they are able to bestow spell-casting abilities upon the templars who serve them. They rule over the Tablelands, each an utter sovereign of one of the Seven Cities.
Whether addressed as Magnate in one place and Vizier in another, they are always the absolute dictator of their subjects. Sorcerer Monarchs are at the top of the social order. They live near the center of the city in a fortified palace bustling with a sophisticated hierarchy of bureaucrats, nobles, and rapacious clergymen. Each city is a state unto itself, its king wielding absolute authority over every living thing inside its walls and crawling through its fields. When a potentate finds it necessary to leave his palace, he does so only with a great deal of preparation and pomp, well-protected by magic and his full bodyguard. If this cannot be arranged, he will not leave (except in the most dire of emergencies). The last thing any Sorcerer Monarch of Athas wants is to walk unprotected among his subjects.
All monarchs jealously guard the use of magic and employ a sizable force of templars whose sole duty it is to ferret out and execute unauthorized Preservers.