Courtiers often flock around monarchs, but non-royal courts (ducal courts, electoral courts) also existed.
Louis XIV of France systematically subjected the French aristocracy to political emasculation by involving them as courtiers in the empty but time-consuming rituals and intrigues of a purpose-built palace of Versailles.
The placemen and rewarded campaign-donors of the political system of the United States of America form a more modern group of de facto courtiers.
See also: The Book of the Courtier