When Charles I of England was under close watch of the parliamentarians in Holdemby in 1647, some communication with the outside was conducted clandestinely. When searching for Cardinal Mazarin's cipher, I came to know that Mazarin bade Bellievre to obtain a peace between the King and the parliament, and the latter even managed to deliver a cipher to the King.
I added this episode to "King Charles I's Ciphers".
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