Book of Knowledge of All Kingdoms
The Libro del Conosçimiento de todos los rregnos or Book of Knowledge of All Kingdoms, also known as the Book of All Kingdoms, is an anonymous 14th-century Castilian geographical and armorial manual (dated to c. 1385). It is written in the form of imaginary autobiographical travelogue of a Castilian mendicant friar, as he travels through the entire world, known and fanciful, from the westernmost Atlantic islands, through Europe, Asia, Africa and the Arctic, identifying all the lands, kings, lords and their armorial devices as he passes them. The only explicit information is that the anonymous author claims to have been born in Castile in 1305.
The full title is also cited as Libro del conosçimiento de todos los reynos y tierras y señoríos que son por el mundo, et de las señales et armas que han cada tierra y señorío por sy y de los reyes y señores que los proueen "Book of the Knowledge of all the Kingdoms, Lands and Lordships that are in the World, and the arms and devices of each land and lordship, or of the kings and lords who possess them" (Markham 1912).
The book's principal objective may have been as an armorial roll. Its choice of presenting itself in the form of an imaginary travelogue may have been whimsical, to tap into the fashionable travel literature of the era, popularized by Marco Polo and John Mandeville. Its geographical features are closely related to those of the Medici Atlas (notionally dated 1351, but probably c.1370). Also near-contemporary is the Catalan Atlas.