In 1825, a mysterious double edged sword containing a cryptic code was found in the River Witham near Lincoln in England. The 13th century sword contains an enigmatic 18-letter message running down the center of the blade, and cryptographers and linguists have been unable to crack it. The British Library is now appealing to the public for help in solving this 800 year old mystery.
The sword, which is currently on display at the British Library as part of the Magna Carta exhibition.
The 18-letter message reads: NDXOXCHWDRGHDXORVI.