47 03 77 57 00 9 … 30 · 16 · 40
sopra … S.S.tà · Inghilterra · cattolici
00|81 = a · 07|83 = e · 05|85 = i · 03|87 = o · 9 = separator · 78 = che · 84 = per

Portugal → Rome · two-digit homophonic cipher with a small nomenclator · 1579–81

Sauli and Riario, from Portugal to the Secretariat, 1579–81

Tolomeo Gallio
toTolomeo Gallio

Archivio Apostolico Vaticano, Segreteria di Stato, Portogallo 8 · DECODE R190–R194, five ciphertexts, 22 pages · catalogued as partially decrypted (catalogue item 260)

The contemporary interlinear decipherments were transcribed and checked by decrypting the figures with George Lasry’s reconstructed key; five code words were added to the key

Daniel Bourdeau · posted · updated

Method: read from existing decipherment · Extent: complete

Summary. Portogallo 8 holds the letters of the nuncio Antonio Sauli (1579) and of Cardinal Alessandro Riario, legate a latere to Philip II during the Portuguese succession (1580–81). Their sensitive passages are in figures. DECODE has five of these ciphertexts, catalogued as partially decrypted, with a key George Lasry reconstructed in 2020 and his decryption of the first two (ff. 92–101). The catalogue here listed them as a probable transcription job, and the images bear that out: almost every cipher passage has the secretariat’s decipherment written above it, so the letters were deciphered on arrival. For the three records without a posted decryption (R192–R194, eleven pages) the digits of each passage were transcribed and decrypted with Lasry’s key. Every legible passage agrees with its gloss, and lining the two up gives five code words the key lacked: 16 Inghilterra, 30 S.S.tà, 36 Francia, 40 cattolici, and probably 10 Italia. What they say: the Pope’s warning about a plot touching Piedmont (the Marquis of Ayamonte, the Anselmi, Huguenots from the Dauphiné); the Italian troops raised under the Pope’s name for Ireland, their pay, and the Queen of England’s ships; and Philip II’s answer that the English enterprise must wait until Flanders is subdued. A few code groups stay open, along with one short unglossed tail.
Top of a cipher letter: Italian clear text with underlined digit strings, and the decipherment written above them
R192, fol. 195r: “Hoggi li 4 … ho parlato a S. M.tà”, then sopra il neg.o di Piamonte written over its figures, and avvertimento over 01 27 03 57 37 … Image: Archivio Apostolico Vaticano, Segreteria di Stato, Portogallo 8 f. 195r, via DECODE R192.

01 The documents and the key

DECODEFoliosPagesWhat
R19092r–95r5Includes a passage headed “Al conte di Desmon[d]”, on the soldiers of His Holiness in Ireland. Decrypted by Lasry. The author is not established: the folios lie between the Sauli and Riario runs.
R19198r–101r6Ortiz; the “distruttione di quelli poveri Italiani”; the soldiers’ pay. Decrypted by Lasry.
R192195–1976Riario: an audience with Idiáquez “li 4”; pp. 5–6 a “Copia” dated 29 November 1580
R193236–2383Riario to the Cardinal of Como, Badajoz, 2 [October?] 1580; p. 3 a clear decifrato from Elvas, December 1580, signed A. Card.le Riario
R1942812Riario (by hand and subject); undated. The Irish captains, money, Flanders first, the truce

The key is Lasry’s reconstruction: fixed two-digit homophones (a 00 81, e 07 83, i 05 85, o 03 87, l 25 75, u/v 01 27, one number for each other letter), a few words (78 che, 84 per, 24 quell, 14 quest, 44 ancora, 28 M.tà) and the single digit 9 as a word separator. No group begins with 9, so a digit string splits in only one way. Numbers are left as plain numerals between separators (“4 mesi”, “1300”).

02 What the ciphers say

R192, Riario. Riario spoke with the King “sopra il negotio di Piamonte”. Philip II was very pleased with the avvertimento and much obliged to His Holiness. Idiáquez then came to report that the King had taken the warning in good part. Cipher passages name the Marquis of Ayamonte, formerly governor of Milan, the Anselmi, and Ugonotti of the Dauphiné who were to help them in Italy. The King promised that nothing would disturb Italy. Further on: the Italian soldiers were to be sent with artillery, munitions and four months’ pay under the name of S.S.tà. Going on in plain danger, they would all be killed, because the Queen of England’s ships and men were waiting. The appended copy of 29 November 1580 answers the King’s ministers. The English enterprise must wait until Flanders is pacified. The Italians are embarked on the river at Lisbon with victuals for three months and are to be sent back toward Italy.

R193, Riario to the Cardinal of Como, Badajoz. The impresa d’Inghilterra: the King lacks the means and wants Flanders subdued first. It also covers galleys, Italian infantry, and 1,300 badly armed soldiers in need of “aiuti, armi et munitioni”. The third page, a clean decipherment from Elvas, says of the President that he “è pietra scandali et mal sodisfatto della Corte romana”.

R194. The Irish captains; the King needs a “gran provisione di dinari” and must settle Flanders before “questa impresa”; the truce; la Religione Catolica in Fiandra.

Per-passage digit strings, decrypts and glosses are in the repository (transcription_R192.md, transcription_R193_R194.md).

03 Method

The five records, their 22 page images and DECODE’s attachments were fetched. The attachments are Midas’s 2017 transcription of R190–R191, Lasry’s key and his decryption. That decryption covers only ff. 92–101, so R192–R194 had key but no text. Two image-reading passes transcribed the digits of each cipher passage on those eleven pages and copied the interlinear gloss. A table decoder applied Lasry’s key. Where a digit was ambiguous in this hand (3/5/8, 0/6, 1/7), the value that gives Italian was kept. That makes the decrypt a check on the gloss rather than an independent decryption. Groups that decrypted to nothing in the key were lined up with their glosses to recover code words.

04 What remains uncertain

05 Sources

Notes, decoder and transcriptions: sauli1579/.