The Mystic Lamb of Van Eyck (Ghent Altarpiece, 1432)

The identity of the work

The altarpiece is a polyptych — an assembly of painted panels joined by hinges, which opens and closes like a liturgical piece of furniture. Closed, it shows eight panels; open, it unfolds twelve, on two superimposed registers. The whole measures about 3.75 metres high by 5.20 metres wide once open, and it is painted entirely in oil on oak panels^[1][2].

Designed to surmount the altar of a private chapel, it belongs to the great family of medieval altarpieces, but it represents an already accomplished and learned form of them, in which painting prevails over sculpture and goldsmiths' work. Its Flemish name, Het Lam Gods ("the Lamb of God"), sums up its whole programme.

The dedicatory quatrain: Hubert and Jan van Eyck

On the frame of the altarpiece runs a Latin inscription, a quatrain naming the two artists and the date of completion. Long suspected of being a later addition, it was authenticated as original during the restoration, in 2020^[3]. Translated, it reads:

"The painter Hubert van Eyck, greater than whom none is found, began this work; Jan, his brother, second in art, completed the heavy task at the request of Joos Vijd. By this verse, on 6 May, he entrusts to you what has been accomplished." — Quatrain on the frame of the Ghent Altarpiece, c. 1432^[4]

This text is precious: it fixes the date of installation to 6 May 1432, attributes the beginning of the work to Hubert van Eyck and its completion to Jan van Eyck, and names the donor. Yet Hubert died in 1426, six years before completion^[5]. The exact division of labour between the two brothers remains one of the great enigmas of art history: who painted what? Critics long suspected Hubert's role had been exaggerated, even invented, before recent research rehabilitated him.

The restoration brought an unexpected argument: beneath the panels of the Virgin and John the Baptist, conservators deciphered hidden inscriptions bearing the name "Lubrecht" (Hubert) and his date of death. Everything suggests that Jan painted the upper register as a tribute to his deceased brother, as a prayer for the rest of his soul — so that the altarpiece may in fact be formed of two intertwined ensembles^[6].

Joos Vijd and Elisabeth Borluut, the donors

The work is not an ecclesiastical commission but a private foundation. The wealthy Ghent notable Joos Vijd and his wife Elisabeth Borluut commissioned it for the funerary chapel they had founded in Saint John's collegiate church (now Saint Bavo's Cathedral)^[7][8]. They are shown, kneeling in prayer, on the outer shutters of the closed altarpiece: portraits of striking realism, among the first true bourgeois portraits in Western painting.

This funerary destination illuminates the whole programme: a donor couple commissions, for the place where Masses will be said for the rest of their souls, an immense image of salvation — the sacrifice of the Lamb, the communion of saints, the celestial Jerusalem to which they hope to be admitted.

Oil and glazes

A tenacious legend, spread from the 16th century by Giorgio Vasari, makes Jan van Eyck the inventor of oil painting. That is inaccurate: oil was known before him. But the Van Eycks brought it to an unprecedented degree of mastery, superimposing fine translucent layers — glazes — which catch and return light in depth, as through glass^[9][10].

Where egg tempera, the dominant medium until then, dries fast and stays matt, oil dries slowly: it allows infinite transitions, velvety shadows, minuscule reflections. It is this technique that gives the altarpiece its living flesh, its heavy fabrics, its glittering jewels and its haze-drowned distances.

The Van Eycks' "optical" realism

The second leap is that of realism. Van Eyck paints every blade of grass in the celestial meadow, every hair of the furs, every fold of the brocades, every reflection on armour and goldsmiths' work. Botanists have been able to identify dozens of really existing plant species in the Lamb's meadow alone. This precision is no game: it affirms that the visible world bears meaning, that God can be read in the detail of things.

This aesthetic heralds a decisive shift: painting ceases to be an abstract sign set against a gold background and becomes a window open onto the real, where the supernatural manifests itself within the visible, and no longer against it. The Flemish Primitives thus invent a way of depicting the sacred that would remain fruitful for centuries.

On weekdays, the altarpiece stayed closed. The faithful then saw only its outer face, more sober, organised in three registers recounting the economy of expectation: the world before Redemption, suspended on the promise.

The Annunciation

In the middle register unfolds a vast Annunciation. The archangel Gabriel, on the left, greets the Virgin Mary, on the right; between them, a Flemish chamber with windows open onto a town street, bathed in light. This is the moment of the Incarnation: the Word becomes flesh, and the whole machinery of salvation is set in motion. Mary answers, and her words — by a medieval convention — are painted upside down and head to foot, to be legible to God, from Heaven.

Prophets and sibyls

Above, in the lunettes, keep watch two prophets of Israel, Zechariah and Micah, and two pagan sibyls, the Erythraean and the Cumaean. Bringing together Jewish prophets and ancient sibyls was a classical way of affirming that all humanity, Jewish and pagan, had sensed and foretold the coming of Christ. The whole Old World strains toward the event celebrated by the inner face.

The two Saint Johns in grisaille

In the lower register, framing the donors, Saint John the Baptist and Saint John the Evangelist are painted in grisaille — in monochrome grey, to imitate stone sculpture. The illusion is total: one believes one sees two statues in their niches. The two Johns are the patrons of the church (then dedicated to Saint John the Baptist); the Baptist above all is the one who pointed to Christ as the Lamb — he already introduces the theme that will burst forth at the opening.

The kneeling donors

At the far ends, Joos Vijd and Elisabeth Borluut pray, kneeling, their faces marked by age and truth. They are painted on the same scale as the two stone saints — not as tiny crushed figures, but as living persons admitted into the circle of the sacred. That is the meaning of their foundation: through prayer and sacrament, to enter the communion they contemplate.

On feast days, the altarpiece was opened. Grey sobriety then gave way at once to an explosion of colour and gold: earth faded, Heaven opened. Twelve panels compose this vision, on two registers.

The upper register: the celestial Deesis

At the centre of the upper register sits enthroned a majestic figure, crowned with the tiara, clothed in purple, hand raised in blessing, a crown laid at his feet. Critics have always hesitated: is this God the Father or Christ the King in glory? The ambiguity is probably deliberate: it is God in his sovereignty, toward whom all converges^[11][12].

The arch crowning the throne bears a Latin inscription of remarkable theological power:

"Behold God almighty in his divine majesty; the highest and best in the sweetness of his goodness; the most generous of rewarders in his immense largesse." — Inscription on the arch, upper register of the Ghent Altarpiece^[13]

On the hem of the mantle runs another formula, drawn from Revelation: "King of kings and Lord of lords"^[14].

The Virgin and John the Baptist

To the right and left of the throne sit the Virgin Mary, crowned with stars, reading her book, and Saint John the Baptist, clad in his tunic of camel's hair, pointing to the centre. This arrangement — God-Christ between the Virgin and the Forerunner, interceding for humanity — is the great Byzantine formula of the Deesis, here transposed into the Flemish idiom. The inscription on Mary's canopy calls her "more beautiful than the sun and surpassing all the array of the stars"^[15], echoing the book of Wisdom.

The singing and music-making angels

On either side, two panels show angels: on the left, a choir of singing angels pressed around a lectern, faces strained with vocal effort; on the right, music-making angels, one of whom plays a positive organ rendered with an organ-builder's precision. Conservators have noted that the singers' expressions are so exact that one could almost identify the notes they are holding. This is the liturgy of Heaven set in paint — a theme that places this work fully under the sign of music and liturgy.

Adam and Eve

At the two ends, in dark niches, stand Adam and Eve, naked, life-size. These are the first monumental nudes of Northern painting, of shattering realism: skin, shadows, the awkwardness of bodies. They recall the original sin that made the Lamb's sacrifice necessary — the drama opening the whole history of salvation, told elsewhere in the account of the Garden of Eden. Above them, in grisaille, the murder of Abel by Cain: the first death, first figure of shed blood.

The lower register: the Adoration of the Lamb

Right at the bottom, on five panels composing a single panoramic landscape, unfolds the scene that gives the work its name. In the midst of a vast flowering meadow, on an altar draped in red, stands a Lamb: it looks at the beholder, and from its open side blood flows into a golden chalice. Around the altar, a circle of angels bears the instruments of the Passion and the incense. Above, the dove of the Holy Spirit radiates in a golden sky.

On the altar frontal one reads the Baptist's very words:

"Behold the Lamb of God who takes away the sin of the world." — Inscription on the altar, after the Gospel of John (Jn 1:29)^[16]

In the foreground gushes the Fountain of Life, whose water streams toward the beholder. Its rim bears this inscription: "This is the fountain of the water of life, flowing from the throne of God and of the Lamb"^[17], a direct quotation from Revelation. And from every side converge the multitudes of Heaven: prophets and patriarchs of the Old Covenant, apostles and popes of the New, martyrs, virgins, confessors. On the side shutters, on horseback or on foot, still approach the Just Judges, the Knights of Christ, the Hermits and the Pilgrims.

The genius of the altarpiece is to be at once a painting and a catechesis. Everything in it is ordered by a central idea: the Lamb is Christ sacrificed for the world's salvation, and all Heaven adores him.

"Behold the Lamb of God": the Agnus Dei

The image comes from Saint John the Baptist pointing to Jesus on the banks of the Jordan: "Behold the Lamb of God, behold him who takes away the sin of the world" (Jn 1:29). Behind it stands the whole typology of the paschal lamb: the slain lamb of Exodus whose blood, on the doorposts, turned death aside; the Suffering Servant of Isaiah, "like a lamb led to the slaughter" (Is 53:7). The Catechism gathers these threads: Jesus is the true paschal Lamb, whose sacrifice delivers us^[18].

The altarpiece shows the Lamb standing and alive, even as it bleeds: this is the whole Christian paradox, the slaughtered one who lives, the victim who is the victor. That is why it is not lying down, but raised upon the altar, conscious, turned toward us.

The slain and living Lamb of Revelation

The direct visual source is the book of Revelation, read and re-read verse by verse. In chapter 5, John sees "a Lamb standing, as though slain", whom all creation adores (Rev 5:6-13). In chapter 7, it is "a great multitude, which no man could number, from every nation, tribe, people and tongue", clothed in white, standing before the throne and before the Lamb (Rev 7:9). In chapter 14, the Lamb stands on Mount Zion, surrounded by the redeemed.

"They have washed their robes and made them white in the blood of the Lamb." — Revelation 7:14^[19]

Van Eyck stages this text: the processions in white, the Lamb on the height, the endless liturgy of the elect. The Catechism recalls moreover that the earthly liturgy shares in this celestial liturgy where "the slain Lamb" stands at the centre of adoration^[20].

The Fountain of Life and the blood in the chalice: the Eucharist

The most important detail is perhaps not the Lamb itself, but the chalice catching its blood. Here the apocalyptic vision meets the altar of churches: the blood shed once on the Cross is the blood offered at every Mass. The Lamb of Heaven and the host of the altar are the same Christ. The altarpiece, set above an altar where the Eucharist is celebrated, makes the two coincide: what the priest elevates below, the saints adore above.

The Fountain of Life, in the foreground, extends this meaning. Its water gushes "from the throne of God and of the Lamb" (Rev 22:1); it evokes Baptism and the water which, with the blood, flowed from Christ's open side. The vertical axis linking the dove of the Spirit, the Lamb and the fountain pictures Saint John's words: "There are three that bear witness: the Spirit, the water and the blood, and these three tend to the same end" (1 Jn 5:7-8)^[21].

The communion of saints: the processions of the elect

The four groups converging on the Lamb are no mere decoration: they figure the communion of saints, the Church in all her vocations. Patriarchs and prophets of the Old Covenant; apostles, popes and doctors of the New; martyrs in red; crowned virgins; on the shutters, the just of every condition — soldiers, hermits, pilgrims — who sought God by every path.

The message is limpid: Heaven is not a solitude, but an assembly. Every state of life finds its place there; every age meets there around the one Lamb.

The celestial Jerusalem

In the background, beyond the meadow, rise the towers and spires of a city: this is the celestial Jerusalem of Revelation, "the holy city coming down from heaven, from God" (Rev 21:2). In it have been recognised the outlines of real monuments, of Ghent and elsewhere, as if to say that the city of God takes flesh in the cities of men. There, "there shall be no more night; they need no lamp nor sun, for the Lord God will give them light" (Rev 22:5): that is why the whole panel bathes in a golden light coming from no visible sun.

Few works have been so coveted. Over six centuries, the Ghent Altarpiece has been the target of thirteen attacks, thefts, lootings and displacements — to the point of often being called the most stolen work of art in history^[22].

Iconoclasm, Revolution and Empire

As early as 1566, the altarpiece nearly burns at the hands of the Calvinists sacking church images across the Low Countries. It is dismantled and hidden in time. Two centuries later, the French revolutionary armies carry its central panels to the Louvre (1794); they will return only after Waterloo. In the 19th century, the shutters are sold, sawn in two through their thickness to display both faces, and dispersed as far as Berlin, before the Treaty of Versailles (1919) returns them to Belgium.

The theft of the Just Judges (1934)

In the night of 10 April 1934, the panel of the Just Judges (and its reverse, John the Baptist) disappears from the cathedral. The thieves leave a note: "Taken from Germany by the Treaty of Versailles."^[23] What follows is a case long famous in Belgium: ransom letters demanding a million francs, half a panel returned as pledge, then silence. A Ghent exchange agent, Arsène Goedertier, confesses to his lawyer, on his deathbed, in November 1934, that he knows where the panel is — "I alone" — but he carries the secret to the grave^[24]. The panel has never been recovered; its place is occupied today by a copy painted in 1945.

Nazi looting and the Monuments Men

During the Second World War, the altarpiece becomes a Nazi obsession. Sheltered in France, it is seized on the direct order of Hitler, who meant it for the great museum he dreamed of building in Linz. Hidden at last in the Altaussee salt mine in Austria, among thousands of looted works, it narrowly escapes destruction ordered at war's end. In 1945, the Allied Monuments, Fine Arts, and Archives unit — the famous Monuments Men — discovers it intact deep in the mine and solemnly repatriates it to Belgium^[25]. The episode has inspired books and films.

A major scientific campaign

From 2012, Belgium's Royal Institute for Cultural Heritage (KIK-IRPA) undertakes a restoration of unprecedented scale, conducted before the public eye in Ghent's Museum of Fine Arts. The campaign advances in phases: the outer shutters (2012-2016), then the lower register with the Lamb (2016-2019), finally the upper register, under treatment from 2023 to 2027^[26]. Conservators discover that the altarpiece is covered, over wide areas, with old overpaints — mostly 16th-century — which distort its colours, details and even faces^[27][28].

The Lamb's face rediscovered

The most spectacular revelation concerns the Lamb itself. Beneath the overpaint, which had given it a banal sheep's head, low in profile with splayed eyes, reappears Van Eyck's original face: frontal eyes, astonishingly human, almost staring, a shorter muzzle, open nostrils. Unveiled in 2019, this face of "disturbing anthropomorphism" caused a sensation in the world press^[29][30].

Far from being an oddity, this frontal, quasi-human face was intended: the Lamb looks the faithful straight in the eye, because it is Christ giving himself and gazing at the one he saves.

A study published in 2020 in the journal Science Advances, based on chemical imaging of the paint layers, confirmed that the restoration faithfully respects the Van Eycks' original intention: this human gaze belongs to the 15th-century design, not to a restorer's fancy^[31].

The quatrain authenticated, Hubert's name recovered

It is also the restoration that authenticated the quatrain on the frame as original, and deciphered, beneath the upper-register panels, the hidden inscriptions bearing the name and death date of Hubert van Eyck. Far from being a myth, the elder brother is thus confirmed in his role, and the upper register appears as a funerary monument Jan is thought to have dedicated to him^[32][33].

The Ghent Altarpiece is not only the starting point of Flemish painting: it is one of the great places of memory of Western Christendom. Generations of artists, from Dürer to our contemporaries, have come to study it; it has been copied, photographed, digitised pixel by pixel within the Closer to Van Eyck project.

But its ultimate depth is spiritual. Before this polyptych, the believer does not contemplate a distant scene: he recognises himself in the processions marching toward the Lamb. The work says, in a single image, what the Church confesses at every Mass — "Lamb of God, who take away the sin of the world, have mercy on us" — and what all Christian life strains toward: the vision of God in the celestial Jerusalem. Like the great architecture of cathedrals or the ancient mosaics, it makes beauty a path toward mystery: not an ornament, but a door.

• Medieval altarpieces — the great form of sacred art of which the Mystic Lamb is one of the summits.
• The symbolism of the altar — why the altarpiece crowns the altar of the Eucharistic sacrifice.
• The Garden of Eden and original sin — the drama of Adam and Eve opening the history of salvation painted by Van Eyck.
• The architecture of a cathedral — the stone shrine in which the work lives.

Selected bibliography: Erwin Panofsky, Early Netherlandish Painting (Harvard University Press, 1953); Elisabeth Dhanens, Van Eyck — The Ghent Altarpiece (Allen Lane, 1973); Till-Holger Borchert, Van Eyck (Taschen); the scholarly site Closer to Van Eyck (KIK-IRPA); official notice of Saint Bavo's Cathedral in Ghent.