Cardan Greenbriar is a fictional character from the young adult fantasy series titled The Folk of the Air, written by Holly Black. He is the prince of the Faerie realm and is known for his cunning personality and complex relationships with other characters, particularly Jude Duarte, the series' protagonist. Throughout the series, Cardan struggles with his identity and the expectations placed upon him as a royal. His character evolves from a seemingly cruel and arrogant figure to someone who grapples with loyalty, love, and the consequences of his actions in the magical world of Elfhame.