Prince Rilian is a character from C.S. Lewis's fantasy novel, "The Silver Chair," which is part of the Chronicles of Narnia series. He is the son of King Caspian and is known for his bravery and noble spirit. Rilian is initially missing, having been captured by the evil Green Witch while searching for his father. Throughout the story, Rilian is portrayed as a young man who struggles against enchantment and seeks to reclaim his identity. With the help of Eustace Scrubb, Jill Pole, and Puddleglum, he ultimately confronts the witch and breaks free from her spell, restoring his rightful place in Narnia.