June 23, 1584

June 23, 1584 is the date on which the book’s imagined history turns a missed rendezvous into a calendar mystery: English and French Templars may each have kept the appointment correctly according to their own calendar, yet arrived ten days apart. Casaubon presents the mismatch as an explanation for the meeting’s failure, then uses it to construct a wider, conjectural lineage involving John Dee, Guillaume Postel, and Francis Bacon. The date matters both as a concrete discrepancy in civil time and as the point where a historical accident is made to bear the weight of the Plan.

The calendar discrepancy

The proposed explanation begins with the staggered adoption of the Gregorian reform. The reform was promulgated in 1582, but its calendar changes took effect at different times in different countries. France adopted the new calendar in 1583 and omitted ten days in December. England did not adopt it until 1752. Thus, when it was June 23 in France in 1584, it was still June 13 in England. The same written date did not name the same day in both countries.

That difference turns the appointment into a problem of coordination rather than, in Casaubon’s telling, evidence that either party deliberately abandoned it. The French delegates would have gone to the agreed place on June 23 by their reckoning. If they waited until the day they understood as July 3, they could conclude that the English had failed to come. The English, meanwhile, could arrive on their own June 23, which was already July 3 in France, and find the rendezvous empty. Each side’s expectation was internally consistent; the calendars made their expectations incompatible.

The timing is sharpened by the appointment’s association with Saint John’s Eve. The parties were supposedly to meet on that observance, but the calendar reform meant that the English and French could attach the same date to different days. The error is therefore not simply a mistaken numeral: it separates a shared religious and political occasion into two successive appointments, neither of which brings the delegations together.

The missed rendezvous

In the reconstruction, the meeting was meant to be furtive, at a particular corner at a particular hour, not a public gathering announced with ceremony. The French arrive first and wait through successive days; after as many as seven days, they leave, believing that some failure or disaster has intervened. The English arrive later, on the third according to the French calendar, and discover that no one is there. They too may wait a week before departing. The two grand masters have missed one another without either side necessarily knowing why.

This account is offered in a conversation between Casaubon and his colleagues, not as an independently established historical finding. Casaubon checks a perpetual calendar and builds the explanation from the national dates of adoption and the omitted days. The resulting scenario supplies a precise, plausible mechanism for a failure that otherwise invites speculation, while its details about the clandestine corner, the waiting periods, and the delegates’ conclusions remain part of his reconstruction.

Dee and the aftermath in the theory

Casaubon next connects the calendar problem to John Dee, whom he describes as an English mage, cabalist, astrologer to the queen, and leader of a magical and Hermetic renaissance. Around 1584, Dee had been assigned to study the reform of the Julian calendar. Casaubon treats that work as a clue: the man supposedly associated with the English Templar group would have had reason to investigate a calendrical error after the missed appointment. Dee’s astronomical knowledge, in this account, makes him capable of recognizing the source of the discrepancy, but recognition comes too late to repair the lost contact.

The narrative then carries Dee from England toward Central Europe. Casaubon says that Dee read Trithemius’s Steganographia in manuscript from 1584 onward, because it did not appear in print until the early seventeenth century. Unable to identify whom to contact in France, Dee is said to have traveled to Prague, where he met Heinrich Khunrath. Casaubon links Khunrath’s allegorical plates to the later work of Andreae and the Rosicrucian manifestos, extending the consequences of the failed meeting into the story’s account of Hermetic and Rosicrucian history. Dee is also said to have died in 1608, burdened by remorse over an error that could no longer be put right.

Postel and the proposed Refuge

A parallel strand assigns the French side a prospective leader in Guillaume Postel. Casaubon argues that Postel, who traveled in the East and was a contemporary of Isaac Luria, retracted his heresies in 1564 and retired to Saint-Martin-des-Champs. He reads that retreat as evidence that Postel was awaiting the 1584 appointment and identifies him as grand master of the French group. But Postel died in 1581, three years before the meeting. Within Casaubon’s theory, the absence of the person best equipped to interpret the competing calendars helps explain why the French side did not resolve the confusion.

The same reasoning gives Saint-Martin-des-Champs a second role. Casaubon presents it as a place where Templars could be safe and at home, and infers that Postel’s withdrawal there marks it as their Refuge. The argument moves from a biographical fact—the date of Postel’s death and his reported retirement—to a geographical conclusion about the supposed Templar network. The monastery becomes not merely Postel’s destination but the hidden center that the missed meeting failed to reveal directly.

Bacon and the Plan’s expanding reach

Francis Bacon enters the reconstruction first as a young man connected to the English intellectual world around Dee, and later as a figure who supposedly encountered a mystery among his ancestral possessions. Casaubon emphasizes that Bacon was only twenty-three at the time of the failed appointment. In 1621, Bacon became Viscount St. Albans; that same year he was accused of corruption and imprisoned for a time. Casaubon interprets the coincidence as a sign that Bacon had uncovered something that frightened someone, although the claim is presented as an inference rather than demonstrated evidence.

The proposed consequence is that Bacon came to understand Saint-Martin should be watched and conceived of placing his House of Solomon there, a laboratory intended to discover the secret through experiment. Thus a ten-day calendrical offset becomes, in Casaubon’s account, the first turn in a chain that reaches from the absent French grand master and Dee’s belated investigation to Bacon’s supposed institutional design. The date’s narrative force lies in that conversion: a mundane administrative difference becomes the origin point of an elaborate secret history, even as the reconstruction’s increasingly ambitious conclusions expose how readily a small discrepancy can be made to support a much larger pattern.