Narnia is the fictional land ruled by Rilian’s father in C.S. Lewis’s The Silver Chair. Rilian is the lost prince of Caspian’s kingdom, and his disappearance drives the quest undertaken by Jill Pole, Eustace Scrubb, and Puddleglum.
The Silver Chair was published in 1953 and is the fourth book in the series according to its internal chronology. It is also commonly listed as the sixth book in publication order, depending on which ordering system a reader uses.
The story moves between the surface world of Narnia and the Underland, where the protagonists confront the Lady of the Green Kirtle. The imprisoned prince’s identity and the nature of enchantment are central to the plot.
Narnia is sometimes mistaken for the name of the entire series, but it is the fictional world in which the stories take place. The series is generally called The Chronicles of Narnia, while individual books focus on different characters and periods.