Charles' princedom refers to a territory or domain ruled by Charles, the prince. Synonyms for this phrase could be "Charles' realm," "Charles' kingdom," or "Charles' dominion." Other variations include "Charles' sovereignty," "Charles' fiefdom," or even "Charles' empire," depending on the extent and power of his rule. These phrases all convey the idea of a territory or region that is under the control and authority of Charles. Although they may differ in connotation and nuance, they all describe the same concept: a domain governed by the prince, whatever form it may take.