A Meeting Both Men Agreed to Erase

By late 1821, San Martín's campaign to liberate Peru had stalled. He had proclaimed the country's independence in Lima that July, but royalist forces still held the Andean interior, and residents of the capital regarded his army, drawn largely from Argentina and Chile, as an occupying force rather than a liberating one. San Martín wrote to Bolívar, whose Colombian army had by then cleared royalist strongholds from the Caribbean coast to the Andes, proposing that the two forces combine to finish the war.

That proposal became the Guayaquil Conference. San Martín sailed north and met Bolívar in the Ecuadorian port city on July 26 and 27, 1822. Before they spoke, the two generals agreed to a condition unusual even for a summit between allies: no aides, secretaries, or interpreters would be present, and neither man would keep a written record. It is the reason that, two centuries later, no transcript, minutes, or eyewitness account of what was actually said between them has ever surfaced. What is documented is the practical outcome: San Martín, by his own later account, offered to place his own army under Bolívar's command, and Bolívar, by most tellings, agreed only to send reinforcements north rather than to share command, though historians still dispute the exact scale of that early troop commitment.

San Martín returned to Lima within days. He gave no public account of the conversation, then or later. Bolívar did not either.

The Resignation Nobody Fully Explained

On September 20, 1822, the day Peru's Constituent Congress was formally installed, San Martín removed the bicolor sash that marked his authority as Protector of Peru and resigned every public office he held, describing the resignation to Congress as irrevocable. His farewell message included a line that reads, in hindsight, like a direct response to a conversation he never described: "The presence of a successful soldier, no matter how disinterested, is dangerous to the States that have just been constituted."

He left Peru for Chile within weeks, then returned briefly to Argentina before settling permanently in Europe from 1824 onward. He spent his final years in Boulogne-sur-Mer, on France's northern coast, and died there in 1850. In nearly three decades of retirement, he never published a memoir or a detailed public account of the Guayaquil meeting. The silence was deliberate enough that historians reconstructing the conference have had almost nothing from San Martín's own hand to work with beyond one private letter, written decades later to a single correspondent.

One Letter, Twenty-Six Years Later, From Only One Side

That letter is dated September 11, 1848, sent from Boulogne-sur-Mer to Ramón Castilla, then president of Peru, a man San Martín trusted enough to explain himself to in private. "My interview in Guayaquil with General Bolívar convinced me, despite his protests, that the sole obstacle to his coming to Peru with the army under his command was none other than the presence of General San Martín," he wrote, "despite the sincerity with which I offered to place myself under his orders with all the forces I had available." He went further: "If America has any service to be grateful to me for, it is my withdrawal from Lima, a step that not only compromised my honor and reputation, but was all the more painful to me, as I knew that with the united forces of Colombia, the war of independence would have been terminated in all of 1823."

That is the fullest surviving explanation San Martín ever gave, and it has real limits as evidence. It is one man's memory of a private conversation, written 26 years after the fact, addressed to a political ally rather than a historian, and it describes only San Martín's own reasoning, not Bolívar's actual words. Bolívar, for his part, never produced anything comparable. What survives on his side is scattered correspondence written in the weeks after the meeting, not a considered retrospective account. That imbalance is precisely why Masur's 1951 scholarly reconstruction, still the standard academic account of the conference, had to be built from secondhand references and later correspondence rather than any record of the meeting itself. No comparable primary source exists for what Bolívar told San Martín, or what San Martín told Bolívar, in the room.

The Letter That Filled the Gap, and the Study That Says It Shouldn't Have

Into that documentary vacuum came a single letter. In 1843, the French merchant and writer Gabriel Lafond de Lurcy published what he presented as a letter Bolívar had written to San Martín on July 27, 1822, the second day of the conference, discussing the future status of Guayaquil and Ecuador. The letter contained language that later readers took as evidence of Bolívar's ambitions to annex Ecuador and, in some interpretations, his openness to a monarchy for the newly independent nations. Because so little else documented the conference at all, the Lafond letter became one of the only near-contemporary documents historians could cite for what Bolívar was actually thinking that week. No original manuscript of it has ever been located. What survives is Lafond's own 1843 publication of the text, and nothing else.

That gap between a published transcription and an actual original document left the letter's authenticity an open question for 180 years. Historians who have examined it point to the missing original and the total absence of any independent corroboration as reasons for doubt, while others have continued to treat it as a legitimate, if imperfect, piece of the documentary record for a meeting that otherwise left almost nothing behind, a dispute that a nineteenth-century paper trail alone was never going to settle.

In 2023, Raúl Isea, a researcher at Venezuela's Instituto de Estudios Avanzados, applied a different kind of test. Using a computational method known as Burrows's Delta, a standard tool in authorship-attribution research that measures how closely a disputed text's word-frequency patterns match a writer's known style, Isea compared the Lafond letter against a reference set of sixteen authenticated letters by Bolívar and eleven authenticated letters by San Martín. Published in the Journal of Current Scientific Research, the study's conclusion was direct: the disputed letter's stylistic fingerprint does not match Bolívar's confirmed writing. Isea's paper reads the result as strong evidence the letter is not authentic, meaning Bolívar most likely never wrote it.

A statistical test of word patterns cannot say what Bolívar actually told San Martín in that room in July 1822, and it does not resolve the conference itself, which remains as undocumented today as it was the day both men walked out of it having agreed to keep no record. What Isea's study does is remove one of the few pieces of paper historians had been able to point to for 180 years. Bolívar earned the leverage that let him set those terms three years earlier, when a flooded plain and an Andean pass the Spanish had written off as impassable in the rainy season turned into the campaign that broke Spanish rule in New Granada. Reputations from this period were not always built on firmer documentation than a disputed copied letter: a French-to-English measurement error, not any real evidence about his stature, is what convinced two centuries of readers that a different general was unusually short. Isea's attempt to test a document nobody could otherwise verify has a more recent parallel, too. A 2025 radar scan searching for a room's worth of looted amber failed to overturn the standing account of how it was lost, a reminder that new instruments narrow these old disputes more often than they close them outright.