Desenclos and Clinet (2025) I mentioned yesterday not only provides many images but also the authors take care to cite primary sources to support their statements. Especially, materials from the archives of the Foreign Ministry are new to me.
Among others, I was excited to see the image of the original cipher for the French plenipotentiaries for the Treaty of Ryswick in 1697. It is the same as the cipher used by them in a first talk in Ryswick in 1694, of which I posted a reconstruction in "French Ciphers during the Reign of Louis XIV". (It will be seen that the reconstruction on my page needs some correction: the inflectional endings "ais" and "ait" should be "ois" and "oit" according to the convention at the time.)
Conversely, I posted the original cipher between Henry IV and the Landgrave of Hesse-Cassel in "French Ciphers during the Reign of Henry IV of France" but the specimen from BnF fr.15920, f.162 (Gallica) was not in my list.
These are only two of the many materials included in this article. It is a treasure trove for students of French historical ciphers.
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