THE SECRET OF THE TOMBSTONE
of Dame Marie de Nègre d’Ables, Marquise de Blanchefort.

ORIGIN
The inscriptions on the tombstone of Dame Marie de NEGRE D’ABLES, d. 17 January 1781, were meticulously removed with a burin by the Abbé SAUNIERE during his nocturnal investigations in the cemetery of RENNES-LE-CHATEAU*; after, this the slab was used to cover the cemetery's new ossuary.
The presence of this stone was duly attested to by E. CROS, and it was placed horizontally on the tomb in 1781 by the Abbé BIGOU, who had retrieved it near Les Pontils.

DESCRIPTION
The tombstone showed a certain number of inscriptions, grouped and judiciously spread out in a symmetrical order. We find here words in Latin and, oddly, a few Greek letters.
Vertically we can see, on the left and right of the slab, two groups of letters that have to be taken as the inscription in Nicolas POUSSIN's painting:

"ET IN ARCADIA EGO".

 In the centre of the slab are four Latin words, grouped two by two, and which can be read horizontally as well as vertically.
At the top are two capital letters, "P" and "S". Wound around these letters is a curve that starts before the "P" and ends in front of the "S".
At the bottom of the funeral slab an animal is depicted, surmounted by the inscription "PRAE-CUM".
The two inscriptions, top and bottom, are linked by a two-way arrow that separates like an axis the four words in the centre of the slab.

THE TEMPLAR INSCRIPTIONS

THE CENTRAL INSCRIPTION
It is made up of four words that can be read in two directions.

Horizontally:

REDIS* REGIS CELLIS ARCHIS
JESUS, KING OF RHEDAE, HIDDEN IN ARQUES

 Vertically:

REDIS CELLIS REGIS ARCHIS
JESUS, HIDDEN IN RHEDAE, REIGNS** BY THE ARK

THE UPPER CENTRAL INSCRIPTION
P-S are the initials of "PECUNIA SUA", an inscription found on burial places containing a precious deposit.
In this case, the letters "P-S" indicate the presence of a TREASURE behind the HOLY  SEPULCHRE.
The curved line starting before the P and returning to end before the S indicates the nature of the treasure.
The letter of the alphabet preceding the P is the letter O, and that preceding the letter S is R. Thus we obtain the letters O and R (OR), specifying that the treasure is composed mostly of GOLD.***

THE LOWER CENTRAL INSCRIPTION
The animal represented is not an octopus as some have assumed.
It depicts a spider, and we affirm that this is one of the representations of the Ark of the Covenant.
The spider lying in wait at the centre of its web, which is a mortal trap, perceives information coming from every direction.
The Ark of the Covenant, hidden from view on an elevation, emits its mortal rays in every direction, condemning the imprudent person who comes into its cavern... ("Shepherd, no temptation...").

"CUM" is a Latin word translating as "WITH".
"PRAE" translates as "BEFORE" or "BESIDE".

* IS means JESUS (from IesouS).
** See Portal of the Initiates in Chartres Cathedral (ARCHA CEDERIS reads JESUS WILL REIGN BY THE ARK).
*** "LE TEMPLE RETROUVE" p. 69.

 MEANING OF THE INSCRIPTIONS
The central, superior and inferior inscriptions, between which the four central words are found, all geometrically and symmetrically arranged, mean:  

JESUS, King of Rhedae, hidden near Arques, reigns by the Ark.
Behind him is the TREASURE composed of gold.
Not far from him, and in front, is the Ark.

ORIGIN OF THE INSCRIPTIONS

This refers to a "situation plan" from the Templar era:

- After the creation of the Order of the Temple, since it is the Ark (Spider) that can be seen, brought back in 1127 from Jerusalem, an exploit which was the origin of the creation of the Order of the Temple.
- Before the fall of the Order of the Temple, since JESUS, OR (gold), and ARCHE (Ark) are gathered together, which would not be the case after 1307.   

The anagram discovered is simple, and its meaning explicit. If we write from end to end the central inscriptions:

The anagram is:

In this case, P.S. must be read "Pierre Sacrée" (Sacred Stone), and designates the menhir of Peyrolles, still called "Pierre dressée" (Standing Stone) on the French IGN map.

We still had to clarify the P and the S, with the help of the name of neighbouring villages.
- The origin of the name Peyrolles (P) is reported by Patrick FERTE on page 307 of: "ARSENE LUPIN SUPERIEUR INCONNU".
For Louis Fedié, this megalith owed its name to the territory in which it lay, Peyrolles, whose etymology is:

- The origin of the name Serres (S) could, according to Messrs HIVERT and MURAT, come from the Sanskrit "Sar", which means "star" (ser in Celtic). In our view, this could be an allusion to the Holy Grail, one of whose denominations is "The morning star".