Matt Lewis continues his Mystery Month on Gone Medieval with another tantalising enigma of the Middle Ages - possibly the most mysterious manuscript that exists anywhere in the world. Carbon-dated to the early 15th century, the Voynich manuscript is hand-written in an unknown script, embellished with illustrations and diagrams, showing people, fantastical plants and astrological symbols.

Yet the origins, authorship, and purpose of the manuscript continue to baffle experts, which have even included British codebreakers from both World War I and World War II. Matt finds out more from Raymond Clemens, Curator of Early Books and Manuscripts at Yale University.

This episode was edited and produced by Rob Weinberg.

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