The Grange-aux-Dîmes is a Gothic tithe granary at the center of Provins, beneath which a network of deteriorated passages was said to descend through several underground levels. A local newspaper account of two dragoons exploring those spaces gives the building its central importance in Colonel Ardenti’s story: it may have concealed an unknown chamber, but the report never establishes what was found there. That uncertainty becomes the opening through which a conjectural Templar history enters the novel.

Building and Subterranean Setting

The granary’s historical function matters to Ardenti’s explanation. He says the Templars drew strength from collecting tithes directly and owing nothing to the state, while the building associated with that collection stood above passages like those found elsewhere in the area. The story thus links an ordinary economic structure to a subterranean world: the public building and the hidden levels beneath it become complementary images of visible power and concealed history.

The newspaper account locates the explorers first in a subterranean room on the second level. When the caretaker stamped on the earth to indicate that still deeper levels might exist, they heard echoes and reverberations. The sound supplies a suggestive clue, not proof of a further chamber; it prompts the men to fetch lanterns and ropes and enter the passages, crawling forward on their elbows.

The Dragoons’ Descent

According to the 1894 report, the dragoons were Chevalier Camille Laforge of Tours and Chevalier Edouard Ingolf of Petersburg. They reached a large hall containing a fine fireplace and a dry well. After tying a stone to a rope and lowering it, they judged the well to be eleven meters deep. A week later, they returned with stronger ropes. Two companions lowered Ingolf into the well; he found a stone-walled room ten meters square and five meters high, and the others followed. They concluded they had reached a third level, thirty meters below the surface.

The report leaves the most consequential part unresolved. It does not say what the men saw or did in the room, and its reporter admits he lacked the courage to descend into the well himself. By the time Ardenti became interested, many passages had collapsed, and there was no way to establish where the well had been—or even whether it could still be found. The account offers measurements and named witnesses alongside an evidentiary void at its center.

From Ruin to Templar Hypothesis

Ardenti says the report made him want to visit the place. He connects its uncertainty to another story involving the Templars, that of a poor village priest who supposedly found old manuscripts beneath a church stone and later became wealthy. From this resemblance he imagines that Ingolf, who descended first, might have discovered a valuable object small enough to hide in his tunic and kept it from his companions. The passage supports the existence of Ardenti’s speculation, not the discovery he proposes: he acknowledges that the story begins in guesswork, while the chamber’s contents remain unknown.

The granary therefore functions less as a solved archaeological site than as a space that invites a story to be built around what cannot be verified. Its depths give Ardenti a physical setting for a hidden Templar past; its collapsed tunnels prevent him from testing that setting directly. The architecture lends his theory a persuasive shape, but the missing object, inaccessible well, and absent testimony keep that shape conjectural.

The Manuscript and the Plan

Ardenti carries his argument from the underground rooms to a text attributed to Ingolf. He presents a photocopy, explaining that he wishes to spare the original further wear. Casaubon distinguishes the parchment from Ingolf’s transcription, but Ardenti insists that, since the parchment no longer exists, the last copy is the original. He treats the transcription as true because he sees no way the truth could be otherwise—a declaration of certainty that substitutes conviction for independent verification.

The page contains two texts. Ardenti describes the first as a demoniacal litany parodying a Semitic language, then claims to decode a message about thirty-six invisibles divided into six groups. He invokes Johannes Trithemius’s cryptographic systems: first taking the initial letters of the words, then applying a wheel cipher that shifts each letter to the preceding letter of the alphabet, with A becoming Z. His procedure yields a French phrase that he treats as evidence for a secret group. Later, Casaubon and Lia offer a rival explanation: the wording belongs to a seventeenth-century context, and Ingolf may have composed and encoded it himself as a cryptographic exercise. The competing readings make the granary’s story a model of the novel’s larger problem: an obscure remnant can appear to confirm a hidden history, yet its meaning depends on the assumptions brought to it.