1. The son of a monarch.
2. A close male relative of a monarch, especially a son's son.
3. A male royal ruler of a small state, actually, nominally, or originally subject to a king or emperor
synonyms: ruler, sovereign, monarch, king, princeling, crown prince, emir, sheikh, sultan, maharaja, raja
E.G: “Prins Thomas ruling the decks on the utopian lands of Na Manteiga Radio"