Chaol Westfall is a fictional character from the popular book series Throne of Glass by Sarah J. Maas. He serves as the Captain of the Guard in the kingdom of Adarlan and is known for his loyalty and dedication to his duties. Chaol is a skilled warrior and plays a significant role in the series, particularly in the early books. Throughout the series, Chaol's character undergoes significant development as he grapples with his beliefs and relationships. His interactions with the protagonist, Celaena Sardothien, and other characters highlight themes of friendship, honor, and personal growth.