In 2020, letters in cipher from Louvois, Louis XIV's Secretary of War, to Count Lauzun (1690) were deciphered by Norbert Biermann by finding the key in the archives.
It is one thing to decipher a ciphertext, but it is quite another to understand what is written. Norbert provides a background account at Cipherbrain (in German). Since the letters relate to one of my favourite historical characters, William III (the Prince of Orange), I wrote my own version of background article: "Secret Letters Left Unbroken by John Wallis Solved After 400 Years"
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