The Book of the New Sun is a book written by Gene Wolfe. It was published in four volumes:

  1. The Shadow of the Torturer
  2. The Claw of the Conciliator
  3. The Sword of the Lictor
  4. The Citadel of the Autarch

According to the books' appendices, this is ostensibly a book that Gene Wolfe has translated from a manuscript written by Severian, also called The Book of the New Sun, recovered from the far future.