The title Mona Lisa derives from the sixteenth-century biographer Giorgio Vasari, who wrote in his 1550 Lives of the Most Excellent Painters, Sculptors, and Architects that Leonardo undertook for the Florentine merchant Francesco del Giocondo the portrait of his wife, Mona Lisa. In Italian, Monna is a polite contraction of ma donna, meaning "my lady" or "madam". The alternative Italian title La Gioconda and its French equivalent La Joconde refer both to her married surname, del Giocondo, and to the literal meaning of the word, "the jovial one" or "the happy woman".¹¹

Lisa Gherardini was born in Florence in 1479 into an aristocratic family of modest wealth and married Francesco del Giocondo, a prosperous cloth and silk merchant, in 1495.¹² Scholars generally conclude that the portrait was commissioned in the spring of 1503 to commemorate two major milestones in the family's life: the birth of the couple's second son, Andrea, and the purchase of a new family home. For centuries, because Vasari wrote decades after the painting's inception, alternative theories proliferated regarding the sitter's identity, proposing figures such as Isabella d'Este, Pacifica Brandani, or a disguised self-portrait of Leonardo himself.

The question was settled in 2005 when Armin Schlechter, a scholar at the Heidelberg University Library, discovered a marginal note written by Agostino Vespucci, an acquaintance of Leonardo and a chancellery clerk assisting Niccolò Machiavelli. Dated October 1503 and inscribed in the margin of a 1477 edition of Cicero's Epistulae ad familiares, Vespucci's Latin annotation compares Leonardo to the ancient Greek painter Apelles and explicitly states that the artist was currently working on three paintings, the first of which was "the head of Lisa del Giocondo".

Despite the commission, Leonardo never delivered the portrait to Francesco del Giocondo. While the Louvre dates the primary execution of the painting between 1503 and 1506, other art historians, including Martin Kemp and Alessandro Vezzosi, note stylistic and documentary evidence indicating that Leonardo continued reworking the panel past 1513 and as late as 1517. According to the travel diary of Antonio de Beatis, secretary to Cardinal Luigi d'Aragona, who visited Leonardo at his manor of Clos Lucé near Amboise in October 1517, the artist displayed a portrait of a certain Florentine lady painted from life at the request of the late Giuliano de' Medici, Leonardo's patron in Rome between 1513 and 1516.

Leonardo painted the Mona Lisa on a single plank of radially cut white poplar (Populus alba) roughly 13 millimeters thick.¹³ The sitter is presented in half-length, seated in an armchair within what appears to be an open loggia, framed by two dark pillar bases on either side of the parapet behind her. Unlike earlier quattrocento portraits that depicted women in strict profile or stiff frontal poses, Leonardo turned her body at a three-quarter angle while rotating her head toward the viewer, establishing a triangular, pyramidal composition that imparts a sense of calm monumentality and three-dimensional volume.

Her right hand rests gently over her left wrist on the arm of the chair, a gesture of composure that replaces traditional displays of status such as rings or opulent jewelry. She wears a dark, pleated garment with yellow-ochre sleeves and a finely embroidered neckline, along with a sheer, translucent veil (guarnello) draped over her dark, loosely curled hair, an accessory associated with pregnancy or recent motherhood in early sixteenth-century Florence.¹⁴

The portrait is the foremost demonstration of Leonardo's technique of sfumato—derived from the Italian word fumo, meaning "smoke"—which eliminates hard outlines and creates imperceptible transitions between light and shadow.¹⁵ Non-invasive X-ray fluorescence and spectroscopic studies conducted by the Centre for Research and Restoration of the Museums of France (C2RMF) demonstrated that Leonardo applied a lead-white priming layer, followed by an initial layer of pinkish flesh tones, and then built up the shadows using ultra-thin translucent oil glazes containing manganese oxide and burnt umber. Applied in layers only a few micrometers thick, with each layer requiring weeks or months to dry, this technique produces a soft, atmospheric modeling entirely devoid of visible brushstrokes.

When Leonardo moved to France in 1516 at the invitation of King Francis I, he brought the Mona Lisa with him across the Alps. Following Leonardo's death on May 2, 1519, or shortly beforehand in 1518 through the artist's assistant Salaì, Francis I acquired the painting for the royal collection for a recorded sum of 4,000 gold écus. The portrait was initially housed at the Palace of Fontainebleau, where it remained for more than a century as a prized centerpiece of the French crown's art holdings.

During the seventeenth century, King Louis XIV transferred the painting from Fontainebleau to his newly expanded residence at the Palace of Versailles. It stayed at Versailles until the French Revolution, when the royal collections were nationalized by the French state. After a brief stay at the Louvre starting in 1793, it was placed on permanent public exhibition at the museum in 1797. In 1800, Napoleon Bonaparte, then First Consul, had the painting removed from the Louvre and hung in Madame Joséphine's and his own private bedchamber at the Tuileries Palace; it was returned to the Louvre in 1804 when Napoleon declared himself Emperor.²⁰

Throughout the nineteenth century, the painting was moved out of Paris during periods of military conflict. During the Franco-Prussian War of 1870–1871, curators evacuated the panel from the Louvre to a hidden vault at the Brest Arsenal in Brittany. During World War II, shortly before the German invasion of France in 1939, the Louvre's paintings department secretly packed the Mona Lisa into an ambulance and relocated it multiple times across Vichy and occupied France—moving it from the Château de Chambord to the Château d'Amboise, the Abbey of Loc-Dieu, the Musée Ingres in Montauban, and finally the Château de Montal—before returning it safely to Paris after the liberation in 1945.

Outside of wartime evacuations and its 1911 theft, the portrait has left France only twice, for two international diplomatic exhibitions in the twentieth century.²¹ In late 1962, following a personal request from United States First Lady Jacqueline Kennedy to the French Minister of Cultural Affairs André Malraux, the French government agreed to lend the painting to the United States despite intense opposition from museum conservators.²² Prior to departure, the panel was assessed at an insurance valuation of $100 million—the highest ever recorded for a work of art—though the policy was never taken out, as the organizers opted to spend the funds on maximum security instead.²³ Crossing the Atlantic in a first-class cabin aboard the ocean liner SS France, the painting was exhibited at the National Gallery of Art in Washington, D.C., and the Metropolitan Museum of Art in New York City between January and March 1963, attracting roughly 1.6 million visitors.²⁴ In 1974, the painting traveled abroad for the final time for exhibitions at the Tokyo National Museum in Japan and the Pushkin Museum in Moscow.²⁵

Although nineteenth-century writers such as Théophile Gautier and Walter Pater had cultivated an intellectual mystique around the portrait's "unfathomable smile," the Mona Lisa was not yet a household image among the general public at the start of the twentieth century.²⁶ Its transformation into a global cultural icon was catalyzed on Monday, August 21, 1911, when the painting was stolen from the Louvre's Salon Carré.

The theft was carried out by Vincenzo Peruggia, a twenty-nine-year-old Italian handyman and glazier from Dumenza who had briefly worked at the Louvre helping construct protective glass shadow boxes for the museum's artworks, including the Mona Lisa itself.²⁷ Entering the museum around 7:00 a.m. on a Monday—when the Louvre was closed to the public for maintenance—or emerging from a small storage closet where he had hidden the previous evening, Peruggia wore the standard white smock of a museum employee. Waiting until the Salon Carré was unattended, he lifted the painting off its four iron wall pegs, carried it into an adjacent service stairwell, removed the ornate frame and glass case, and tucked the bare wooden panel beneath his smock. Finding the exterior service door locked, he unscrewed the doorknob, and an unsuspecting museum plumber passing by unlocked the door with a key and let him out onto the street.

Because paintings were routinely removed from the walls to be photographed on the museum roof, the absence went unnoticed for more than twenty-four hours until Tuesday morning, when the visiting artist Louis Béroud arrived to sketch the gallery and alerted guards to the empty pegs. The French government ordered the Louvre closed for a week, dismissed the museum's director Théophile Homolle, and launched a massive police investigation that drew worldwide newspaper coverage. When the museum reopened, thousands of visitors queued simply to view the blank space on the wall where the portrait had hung. During the investigation, Paris police detained and questioned the avant-garde poet Guillaume Apollinaire—whose former secretary had stolen ancient Iberian statuettes from the Louvre—and interrogated the painter Pablo Picasso before exonerating both men. Although Peruggia's left thumbprint was lifted from the discarded glass case and his prints were already on file from two prior minor arrests in Paris, police investigators using Alphonse Bertillon's anthropometric filing system searched only right-hand thumbprints and failed to make a match, even after interviewing Peruggia twice at his Paris boarding house.

Peruggia kept the painting hidden for more than two years inside a wooden trunk with a false bottom in his small apartment on the Rue de l'Hôpital-Saint-Louis. In late November 1913, using the alias "Leonardo Vincenzo," he wrote to the Florentine art dealer Alfredo Geri, offering to bring the painting to Italy for a reward of 500,000 lire. Peruggia traveled by train to Florence in December 1913 and met Geri and Giovanni Poggi, director of the Uffizi Gallery, in his room at the Hotel Tripoli. After taking custody of the panel to verify its authenticity at the Uffizi, Poggi and Geri notified the Italian police, who arrested Peruggia later that day. At his trial in Florence in June 1914, Peruggia claimed he had acted out of patriotic duty to restore a masterpiece he mistakenly believed Napoleon had looted from Italy. Sympathetic to his nationalist defense, the Italian court sentenced him to one year and fifteen days in prison, later reduced on appeal to seven months, meaning he was released almost immediately due to time served. After being exhibited triumphantly in Florence, Rome, and Milan, the painting was returned to the Louvre on January 4, 1914.²⁸

The physical history of the Mona Lisa has been shaped both by the aging of its wooden support and by repeated acts of vandalism. Sometime prior to the nineteenth century, the thin poplar panel developed a 12-centimeter vertical crack extending downward from the upper edge to just above the hairline on the sitter's forehead.²⁹ In the nineteenth and early twentieth centuries, restorers stabilized the fissure by inserting two butterfly-shaped walnut cleats into the back of the panel and fitting the painting into a flexible oak cradle frame with four maple crossbars designed to accommodate the wood's natural expansion and contraction.

In 1956, the painting was damaged in two separate attacks.³⁰ Earlier that year, while the work was on temporary display at a museum in Montauban in southern France, an assailant threw acid at it, damaging the lower section of the panel. On December 30, 1956, at the Louvre, a Bolivian man named Ugo Ungaza Villegas hurled a rock at the portrait with enough force to shatter its ordinary protective glass, dislodging a speck of pigment near the subject's left elbow.¹ Restorers retouched the chipped spot with watercolors, and museum authorities subsequently placed the painting behind laminated bulletproof glass.

The bulletproof barrier has shielded the panel from four subsequent attacks. On April 21, 1974, during its exhibition at the Tokyo National Museum, a woman named Tomoko Yonezu sprayed red paint toward the case to protest the museum's policies regarding accessibility for disabled visitors. On August 2, 2009, a Russian woman who had been denied French citizenship threw a ceramic teacup purchased in the Louvre gift shop, shattering it against the glass. On May 29, 2022, a climate activist disguised as an elderly woman in a wheelchair rose up, attempted to strike the glass, and smeared cream cake across the enclosure.³¹ On January 28, 2024, two protesters from the environmental group Riposte Alimentaire threw pumpkin soup onto the glass barrier to demand sustainable agricultural policies. None of these four incidents caused any harm to the painting itself.

To protect the fragile poplar board from warping further, the Louvre houses the Mona Lisa inside a sealed, climate-controlled enclosure built in 2005 and upgraded with ultra-clear, non-reflective bulletproof glass in 2019. The case maintains a constant relative humidity of 50 percent (±10 percent) and a stable temperature between 18 and 21 degrees Celsius. Once a year, on a closing day, curators and C2RMF scientists unseal the case to inspect the panel's convex curvature and monitor the crack. Although decades of oxidized varnish applied during an 1809 cleaning and later restorations have given the portrait a heavy yellow-green cast, the Louvre has declined to strip the varnish out of concern that solvents could disturb Leonardo's delicate upper sfumato glazes.

Following the media sensation of the 1911 theft, the Mona Lisa became a primary target for modernist appropriation and mass-media reproduction. In 1919, the Dada artist Marcel Duchamp created L.H.O.O.Q., a "readymade" consisting of a cheap postcard reproduction of the painting onto which he penciled a mustache and goatee, paired with a punning French phonetic acronym below. In the decades that followed, the image was reinterpreted by Salvador Dalí, Fernando Botero, Jasper Johns, and Andy Warhol, who produced silkscreened series such as Thirty Are Better Than One in 1963 immediately following the painting's American tour.

In the twenty-first century, the painting is displayed on a freestanding partition wall in the Salle des États (Room 711) on the first floor of the Louvre's Denon Wing, directly opposite Paolo Veronese's monumental canvas The Wedding at Cana. Because roughly 80 percent of the Louvre's nearly nine million annual visitors seek out the portrait—amounting to some 20,000 to 30,000 people per day—the gallery has suffered from severe congestion, long queues, and noise that overshadows the surrounding sixteenth-century Venetian collection.³²

In January 2025, following a report by Louvre president-director Laurence des Cars detailing the physical strain of overcrowding and aging infrastructure on the museum, French President Emmanuel Macron announced a major ten-year overhaul titled "Louvre New Renaissance".³³ Estimated to cost between 700 million and 800 million euros and scheduled for completion by 2031, the project includes constructing a new eastern grand entrance at the Colonnade de Perrault and excavating new subterranean exhibition halls beneath the Cour Carrée. Under the plan, the Mona Lisa will be moved out of the Salle des États into its own dedicated underground room, accessible via an independent entrance and a separate timed-entry ticket designed to alleviate crowding throughout the rest of the museum.