George Lasry’s decipherment
George Lasry’s report on this item, as he sent it on 24 October 2026 (PDF), in its own order and wording. The decipherment, the translation and the reconstruction of the key are his, made with ChatGPT Astra 6 and Anthropic Opus 5.5. This project’s own checks follow under Verification.
Dupuy 61 — Villeroy, f258r
Contents: Villeroy presses for the Rome mission to leave without delay, warns of Spanish forces and unrest in Paris, and discusses Mayenne and a possible truce.
2/2 pages transcribed; Deciphered
- Ciphertext-only:
- No
- Sender:
- M. de Villeroy
- Recipient:
- M. de La Verrière
- Year:
- 19 July; year not written
- Key:
- 127 codes, 98 homophones, 29 in nomenclature; unmarked numbers ≥ 121 are nulls
- Ciphertext:
- 1164 elements, 1147 identified (98.5%)
- Interlinear plaintext:
- Numerical letter only: Historical interlinear decipherment on f258r,colourPDF527/Gallica525.
- Key elsewhere:
- Volume unknown: original key image in the local Nevers archive. Matches 82 entries used in the numerical letter on f258r.

Excerpt and Translation
f258r

Excerpt
Monsieur, je ne sçay ce que vous pensez faire d’attendre si long temps à faire partir ceux qu[i] doivent aller à Rome. On s’abuze si on pense de pouvoir faire autrement, et ces longueurs prejudicient infiniment, et semble par là qu’on ne desire qu’on effectue […]
Translation
Sir, I do not know what you think you will achieve by waiting so long to send off those who must go to Rome. It is a mistake to think that things can be done otherwise; these delays cause immense harm, and make it appear that there is no desire to carry out […]
Readable text
The full text, folio by folio, as in the report. Bold marks the passages deciphered from the cipher; the rest is the clear text of the letter. Question marks are the report’s: [?] or a bare ? for a sign or group left unread, a ? after a word for a doubtful reading.
Dupuy 61 — Villeroy
f258r
De V. à Monsieur de La Verrière.
Monsieur, je ne sçay ce que vous pensez faire d’attendre si long temps à faire partir ceux qu[i] doivent aller à Rome. On s’abuze si on pense de pouvoir faire autrement, et ces longueurs prejudicient infiniment, et semble par là qu’on ne desire qu’on effectue ce qui est commencé.
Je vous suppl[i]e d’escrire au Roy que si les choses ne succedent comme il les estoient proposez, defaillant ce moyen de Rome, qu’il ne m’en accuse, et que, prolongeant comme il faict, qu’il sera tout esbahy qu’il aura les Espagnolz sur les bras qui reviendront, et lors je ne sçay si nous serons maistres des volontez.
Je vous prie luy dire que ce n’est pour l’intemider comme quelquesfois il m’a voulu accuser, mais la crainte que j’y ay et que je veoy les affaires disposées me le font dire. Et cependant qu’on est en bonne volonté, on ne la doibt laisser escouler.
Je suis sur le point de m’en aller à Paris où il n’y a faulte de remuemens, et espere que dans ceste semaine M. de Mayenne sera où nous verrons ce qu’on pourra faire. Pour ce que ? avez escrit, mais vous ne m’avez fait responce si d’une part on le vouldroit ?.
Je vous prie de dire à ceux qui peuvent au faict dudit voyage pour le faire haster, que je veois bien qu’ilz ne recognoissent l’inportance de ce faict et qu’on fer[a] croire qu’on ne la desire. À l’honneur de Dieu, qu’on se haste, et le prie vous avoir en sa garde. Ce dixneufme juillet.
Par les motz qui sont sur la fin de la lettre, il entend de la trefve ou suspension d’armes.
f258v
Du chiffre de Monsieur de La Verrière.
At a glanceKey from adjacent plaintext · complete
- The letter
- M. de Villeroy to M. de La Verrière, 19 July (year not written); two pages in numbers.
- Where
- Bibliotèque nationale de France, Dupuy 61, f. 258r (Gallica).
- The cipher
- A numerical code of 127 codes: 98 homophones and 29 nomenclature items; unmarked numbers of 121 and above are nulls.
- How it was read
- The letter carries a contemporary interlinear decipherment, which gives the key. The original key image is in the local Nevers archive, volume unknown. This project checked one sample against the Gallica image and did not re-solve it.
- What it says
- Villeroy complains that waiting so long to send off those who must go to Rome is a mistake and that the delays do great harm.
- Still open
- 1147 of 1164 cipher elements are identified (98.5%).
- Credit
- The result is George Lasry’s (BnF cipher research, 10 October 2026).
01 Verification
Spot-check against the manuscript
This result is George Lasry’s. This project did not re-solve the cipher: it checked one sample against the Gallica image and recorded what it found.
- Batch A. Image checked: https://gallica.bnf.fr/ark:/12148/btv1b103164206/f525.item
- Folio matches the report: yes; cipher present: yes
- What we checked: f258r all-numeric letter "A Monsieur de la Verriere" with contemporary interlinear decipherment: "Monsieur je ne scay ce que vous pensez de l attendre si long temps a faire partir ceux qui doivent aller a Rome. On s abuze si on pense de pouvoir faire autrement ... longueurs prejudicient infiniment" = his excerpt; numbers not re-decoded by me from his key
- Verdict: confirmed (method key recovered based on adjacent plaintext, extent complete). The check is a sample, not a re-solution.
- Notes: Foot note "Du chiffre de Monsieur de La Verriere"; docket "Depesche de M. de Villeroy a M. de Verriere". Reading essentially exists interlinearly (could be counted as read from existing decipherment).
02 Other contributions
Where a decipherment or clear copy already existed, as George Lasry gives it:
- Interlinear plaintext
- Numerical letter only: Historical interlinear decipherment on f258r,colourPDF527/Gallica525.
Full texts
The transcription and the decryption of every document on this page, so that the reading can be used and checked. Short files are shown here; all are in the repository.
George Lasry's decipherment (report PDF, 24 Oct 2026)
M. de Villeroy to M. de La Verrière, 19 July (year not written). Villeroy presses for the Rome mission to leave without delay, warns of Spanish forces and unrest in Paris, and discusses Mayenne and a possible truce.
Decryption: in full above, in George Lasry’s decipherment (readable.md)
Reading: in full above, in George Lasry’s decipherment (readable.md)
Translation: in full above, in George Lasry’s decipherment (translation_excerpt.md)
03 Sources
- George Lasry, with ChatGPT Astra 6 and Anthropic Opus 5.5, BnF cipher research, 10 October 2026 (sent to Daniel Bourdeau on 13 October 2026 for publication here), p. 53; his other items are listed on his contributor card.
- The working folder:
targets/villeroy258/(his entry as extracted from the report, our spot-check,profile.json).
