Currently owned by Yale, the Voynich manuscript was discovered in the Villa Mondragone near Rome in 1912 by antique book dealer Wilfrid Voynich while sifting through a chest of books offered for sale by the Society of Jesus. The decades since have been spent trying to figure out if it is anything except made up - researchers recently determined it was from the 15th century, so it is at least not a modern hoax.

Researchers Crack Secret Society's 18th Century Code, Target World's Most Mysterious Book - Fox News
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