Umberto Eco
Volumes from 3 worlds.
3 volumes
The Letter of Prester John Quoted
Baudolino of Alessandria, among others — Baudolino · Umberto Eco
A letter from a fabulous Christian king beyond the Muslims, full of marvels and political convenience — which Baudolino says he helped to write, and which, in our world, really did circulate in the twelfth century.
The Plan Described
Jacopo Belbo, Diotallevi, and Casaubon — Foucault's Pendulum · Umberto Eco
A world-conspiracy, generated for a joke from occult manuscripts and a computer named Abulafia, which occultists then treat as a document and try to extract the secret from — hanging one of its authors from a pendulum when he will not hand it over.
The Second Book of the Poetics Quoted
Aristotle — The Name of the Rose · Umberto Eco
The genuinely lost second book of Aristotle's Poetics, dealing with comedy — reconstructed by Eco, hidden in a Benedictine library, and defended by a murderer who poisoned its pages.