Start with the Louvre's own record
Almost every claim about this painting is worth checking against the museum that owns it, because the second-hand versions drift. The Louvre catalogues the work not as the Mona Lisa but as the Portrait de Lisa Gherardini, épouse de Francesco del Giocondo, dit La Joconde ou Monna Lisa, with La Joconde as the working title. Its support is listed as "huile sur bois (peuplier)": oil on poplar wood, not canvas. It measures 79.4 by 53.4 centimetres, which is smaller than most people picture, and it carries two inventory numbers, INV 779 and MR 316.
The museum dates it to the first quarter of the sixteenth century, giving a range of 1503 to 1519 rather than a single year. On the identity of the sitter the Louvre is blunt, calling the modern hunt for alternative candidates a false problem. Its evidence is a marginal note that Agostino Vespucci, a colleague of Machiavelli in the Florentine chancery, wrote in a copy of Cicero in October 1503, discovered in a Heidelberg library in 2005. Vespucci recorded Leonardo at work on a head of Lisa del Giocondo, which corroborates what Giorgio Vasari published in 1550.
The provenance runs: begun around 1503, probably for the silk merchant Francesco del Giocondo; kept by Leonardo until his death rather than delivered; "très probablement acquis par François Ier en 1518"; absorbed into the national collection in 1793. It hangs today in Room 711 of the Denon wing, level 1, which the Louvre's own catalogue now labels the Salle de la Joconde. Provenance is rarely this untroubled. For a case where the paper trail turned into decades of legal dispute, see Gustav Klimt.
The claim worth testing
The popular account of how this particular panel became the most recognised image on earth is short and satisfying. On 21 August 1911 an Italian handyman named Vincenzo Peruggia carried it out of the Louvre under his coat. For two years nobody knew where it was. The press went berserk, crowds queued to stare at the bare wall, and when the painting came back it was no longer a Renaissance portrait but a celebrity. Fame by theft.
It is a good story and it is not wrong in outline. But it rests on a premise that is rarely checked: that before August 1911 the painting was a quiet, respected, largely unremarked picture that only specialists cared about. That premise is testable. The valuations, the copying registers and the guidebooks of the period all survive, and they record what people at the time thought this painting was worth.
Three kinds of evidence are available for the years before the theft. There is what it was estimated to be worth in money. There is how often artists chose to copy it, which is a direct measure of demand among people who had to physically travel to the gallery and book an easel. And there is what the mass-market travel guidebooks told ordinary visitors to go and look at. All three can be checked, and they do not all say the same thing.
What the money and the copyists say
The historian Donald Sassoon, who wrote the standard study of how this painting became an icon, went through the nineteenth-century valuations. An 1849 estimate put the Mona Lisa on the market at 90,000 francs. That was serious money, roughly twice what a comfortable middle-class house in a good Paris district cost at the time. It was also well behind the competition inside the same building. Titian's Supper at Emmaus was valued at 150,000 francs. Raphael's Virgin and Child with St John came in at 400,000, and his Holy Family at 600,000.
The copying registers point the same way. The Louvre began life as a museum intended mainly for artists to study and copy in, and it kept records of who copied what. Between 1851 and 1880, by Sassoon's count, the Mona Lisa was copied 71 times. Murillo's Immaculate Conception was copied 197 times over the same period, Correggio's Saint Catherine 186 times, Veronese's Wedding at Cana 167, and Titian's Entombment 130.
So in the mid-nineteenth century the Mona Lisa sat somewhere in the second rank of Louvre attractions. Well known and routinely copied, but nowhere near the top of anyone's list. If the story stopped there, the theft explanation would look strong.
The story does not stop there. Between the 1850s and 1911 something shifted, and the guidebooks recorded it.
The guidebook test, 1878 against 1907
Karl Baedeker's handbooks were the closest thing the nineteenth century had to a mass-market ranking system for art. They used a star notation, and a double asterisk was the highest mark the firm gave. Both the 1878 and the 1907 English editions of Paris and its Environs are digitised in full, so the comparison can be made directly rather than taken on trust.
The 1878 edition, in its survey of the Italian galleries, says: "The most celebrated work of Leonardo in the Louvre is his Mona Lisa". The catalogue entry itself, numbered 462, carries two asterisks and runs to a full paragraph, most of it given over to Vasari on the eyes and the mouth, followed by the editor's warning that these qualities "are now concealed by the darkened shades".
The 1907 edition, printed four years before the theft, is stronger, not weaker. The painting is now number 1601, still marked with two asterisks, and the survey text describes it as "the most celebrated female portrait in the world", noting a sphinx-like smile that "still fascinates in spite of the darkened condition of the canvas". That is not the language of a neglected picture. It is the language of a headline attraction.
It is sometimes pointed out that the 1907 catalogue entry is only two sentences long against the 1878 paragraph, and that this shows a demotion. Reading the surrounding pages kills that reading. Every entry in the 1907 edition is compressed. Titian, Velázquez, Veronese and Raphael all get one to three lines each, where the 1878 edition had quoted critics at length. The format changed across the whole book. The rating and the survey text, which are the parts that actually express a judgement, both went up.
One detail in the 1907 wording is worth keeping. Baedeker calls the support a canvas. The Louvre's record says poplar panel. The standard guidebook of the era, on the eve of the most reported art theft in history, had the physical description of the object wrong. That is a useful reminder about where to source hard facts on this painting.
What happened in August 1911
Peruggia was an Italian glazier who had worked at the Louvre on the job of fitting protective glass over prized paintings. He knew the building, and he knew that Monday was the day it closed to the public. On Monday 21 August 1911 he took the panel off its four iron hooks in the Salon Carré, removed it from its frame, and left.
Nobody noticed for more than a day. The alarm was raised on Tuesday 22 August by the painter Louis Béroud, who made a speciality of painting the Louvre galleries themselves and had come to work on a view of the Salon Carré. He found four hooks and a pale rectangle. Museum staff initially assumed the painting had been taken upstairs to be photographed.
The security context explains a lot. The Louvre of 1911 was an enormous building with a guard force far too small for the number of objects in it, and an Egyptian statuette had gone missing about a year earlier. The investigation that followed was chaotic enough that Guillaume Apollinaire was arrested and Pablo Picasso was hauled in for questioning, both over a separate affair involving stolen Iberian statuary, and both were released.
The museum shut for a week. When it reopened, people came to look at the empty space, and enough of them came that the absence became an attraction in its own right. Sassoon records the wider reaction: postcards printed, cartoons mocking the museum's security, songs written, the French cabinet discussing it, and the Louvre's director of paintings resigning.
The machinery that carried the story
This is where the causal argument gets interesting, because 1911 was a specific moment in the history of printing, and that turns out to matter more than the burglary itself.
For most of the nineteenth century a newspaper could describe a painting but could not cheaply show one. Illustration meant an engraver copying an image by hand onto a woodblock, which was slow, expensive and rationed. By 1911 halftone photographic reproduction had become fast and cheap enough for daily use, and the French illustrated supplements were selling around a million copies each. Excelsior, launched in Paris in November 1910 by Pierre Lafitte and billed on its own masthead as a Journal Illustré Quotidien, was built entirely around this: a daily that led with photographs rather than text, running twenty-five to thirty of them per issue.
So the theft happened at the first moment in history when a single picture could be put in front of tens of millions of people within days, simultaneously, across several countries, without anyone having to visit a gallery or buy a book. The crime supplied a story that every paper wanted. The papers supplied a reason to print the image again and again, since a story about a missing painting is unreadable without a picture of the painting.
Notice what this does to the usual formulation. The theft did not confer fame on the Mona Lisa the way a prize confers status. It fed an already well-regarded image into a distribution system that had just become capable of mass reproduction, and it kept feeding it for more than two years. A different painting stolen in 1911 would also have been reproduced everywhere. What made this one stick was that it arrived at the printing presses with a reputation already attached, which is exactly what Baedeker documents.
Florence, 1913, and the second wave
Peruggia kept the panel in his Paris lodgings for two years. In December 1913 he took it to Florence and offered it to the antiques dealer Alfredo Geri, who involved Giovanni Poggi, the director of the Uffizi. Poggi authenticated it, and the police arrested Peruggia.
What followed mattered as much as the theft. Before the painting went back to France it was put on public display in Florence, then shown in Rome and Milan, drawing large crowds and heavy press attention at every stop, and it was back on the Louvre wall by early January 1914. Peruggia stood trial in Florence in June 1914, claimed a patriotic motive, and received a sentence of a year and fifteen days, which was cut on appeal to a little over seven months. In Italy he attracted a certain amount of sympathy.
The recovery gave the press a second saturation event, and this one came with a resolution and a face. The Excelsior front page of Sunday 14 December 1913 shows what that looked like in practice. Under the headline "Ce fut sous une blouse que Mona Lisa fut enlevée", the paper gave over its entire front to a staged photographic reconstruction of the crime, a ring of panels following a man in a workman's smock from the wall of the Salon Carré, down the small staircase, across the Cour Visconti and out onto the quay, with a portrait of Peruggia in the middle. There is almost no text on the page. The front is the pictures.
Sassoon, whose own research supplies most of the pre-1911 numbers quoted above, is nonetheless careful about how much weight the theft can carry. He calls the conclusion that the theft was the main cause of the painting's popularity "premature". His grounds are specific. The publicity was real and the mass press exposure was real, but it did not, in his reading, lay down a durable collective memory. Between 1911 and 1913 the London Illustrated Weekly ran only three long features on the painting, and each time it had to remind readers who she was and why she mattered. Then the First World War rolled over the whole of European public attention.
So what did the theft actually do?
A precise version of the causal claim looks something like this. By 1907 the Mona Lisa was already, in the judgement of the era's dominant guidebook, the most celebrated female portrait in the world, and it had climbed there over roughly sixty years on the strength of the Leonardo cult and a great deal of nineteenth-century French writing. What it did not have was recognition outside the population of people who visited museums or read about art.
The theft, and more importantly the recovery, closed that gap. It attached to the image a story that required no art-historical literacy at all to follow and retell: a small man, a big museum, a missing picture, two years, Florence. Once a painting has a story like that, it can circulate through channels that art does not normally reach, and by 1913 the channels existed to circulate it fast.
The theft also left a physical legacy inside the museum. It converted the painting from an artwork on a wall into a security object, and everything that has happened to it since, the glass and the crowd barriers included, follows from that reclassification.
That reclassification is still generating consequences. The Louvre now caps admissions at thirty thousand people a day, a very large share of whom are in the building specifically for this one panel, and in January 2025 the museum announced plans under the Nouvelle Renaissance project to move it out of Room 711 into a dedicated space of its own by 2031, reached on a separate ticket. The problem the Louvre is solving in 2031 is the one that arrived in the autumn of 1911: too many people want to stand in front of a picture that is fifty-three centimetres wide.