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Tom Gurney BSc (Hons) is an art history expert with over 20 years experience
Published on June 19, 2020 / Updated on August 9, 2026
Email: tomgurney1@gmail.com / Phone: +44 7429 011000

Rembrandt Self-Portrait with Two Circles: Introduction

Rembrandt's Self-Portrait with Two Circles is one of the most searching images of artistic identity in seventeenth-century painting. It shows the older Rembrandt not as a courtier, scholar, biblical character or wealthy Amsterdam portraitist, but as a painter standing before the viewer with the tools of his work. Behind him are two broad circular forms, incomplete or partly obscured, which have made the painting famous and difficult in equal measure.

The work is associated with Kenwood through the Iveagh Bequest and is now under the English Heritage route. English Heritage source material dates it to around 1665 and identifies it as oil on canvas. The English Heritage / Google Arts & Culture partner record uses the title Portrait of the Artist and gives two sets of measurements: 143.5 x 125.2 x 12.7 cm framed, and 114.3 x 94.0 x 1.0 cm unframed. Art UK records the Kenwood and English Heritage ownership route, accession 88028836 and acquisition through the Iveagh Bequest in 1929. CODART also treats the work as a major Rembrandt self-portrait, though its dimensions differ slightly from the unframed figure recorded through the English Heritage / Google Arts route.

Those object details matter because this is a painting that has often attracted confident interpretation. The circles have been read as symbols of artistic mastery, references to geometry, echoes of studio practice, allusions to artistic theory, compositional devices, or signs connected with old stories about painters who could draw perfect circles. Each possibility is worth considering. None should be treated as the final key. The power of the painting lies partly in the fact that Rembrandt makes the circles visible, commanding and unresolved.

This page looks at the painting as a late self-portrait, a statement of profession, a Kenwood picture, a problem of interpretation and one of Rembrandt's most forceful claims about what it means to be an artist.

Contents

  1. Introduction
  2. What the Painting Shows
  3. Title, Date, Medium and Dimensions
  4. Rembrandt as Painter
  5. The Problem of the Two Circles
  6. A Late Self-Portrait
  7. Biography Without the Myth of Defeat
  8. The Face and Gaze
  9. Hand, Tools and Body
  10. Paint Surface and Late Style

What the Painting Shows

Rembrandt stands nearly full-length, turned slightly as he faces outward. He wears a cap and a loose work garment. His body is broad and direct, but the focus gathers in the head, the hand and the strange space behind him. He holds painter's tools, commonly understood as the signs of his profession. He does not need a patron, studio assistant or elaborate narrative to identify himself. The painting tells us that this is Rembrandt as painter.

The face is old, alert and strongly present. Rembrandt does not smooth away age. The brow, cheeks, mouth and eyes carry the weight of time, but the expression is not easily reducible to sadness, pride or fatigue. The gaze meets the viewer with a steadiness that feels both open and guarded. He appears before us, but he does not explain himself.

The right side of the composition is dominated by the two circular forms. They are not neat decorative halos or obvious background ornaments. They are large, pale, structural and slightly mysterious. They seem to belong to the wall or surface behind the figure, yet they press forward as intellectual problems. They are close enough to the painter to feel intentional and distant enough to resist a simple reading.

The tools in Rembrandt's hand give the painting its plainest meaning. This is not just a likeness of a man in old age. It is a painter's self-portrait. The circles deepen that identity. They turn the background into a challenge. The viewer is not only looking at Rembrandt's face. The viewer is looking at Rembrandt in relation to making, measurement, mastery and the stubborn uncertainty of art.

Title, Date, Medium and Dimensions

The familiar title Self-Portrait with Two Circles is useful because it names the element that has shaped the painting's fame. English Heritage / Google Arts & Culture also uses the title Portrait of the Artist, which shifts emphasis from the circles to Rembrandt's professional identity. Both records point to the same central fact: this is a self-image in which Rembrandt presents himself as an artist.

The date is usually given as around 1665 in the English Heritage material. That places the painting in Rembrandt's late period, after his financial crisis and after decades of work in Leiden and Amsterdam. The medium is oil on canvas. The object belongs to the Kenwood / English Heritage context and came through the Iveagh Bequest, the great collection given to the nation by Edward Cecil Guinness, first Earl of Iveagh.

The dimensions need care because not every record appears to describe the same thing. The English Heritage / Google Arts & Culture partner record gives a framed measurement of 143.5 x 125.2 x 12.7 cm and an unframed measurement of 114.3 x 94.0 x 1.0 cm. Art UK's larger measurement, 143.5 x 125.2 cm, aligns with the framed dimensions rather than the canvas size. CODART gives 116.3 x 97.2 cm, close to but not identical with the unframed route.

That variation does not make the painting doubtful. It shows why object facts should be read precisely. A framed painting and an unframed canvas are not the same measurement. For a public reader, the safest summary is that the painting is a large late oil on canvas at Kenwood, with English Heritage / Google Arts separating framed and unframed dimensions and Art UK recording the larger framed figure.

Rembrandt as Painter

Many of Rembrandt's self-portraits involve costume, role-playing or historical memory. In early images he tests expressions, shadows, hats and dramatic faces. In Amsterdam self-portraits he sometimes presents himself through status, costume or old-master dignity. In late works, he often strips the image down to the encounter between face, body, paint and viewer.

Self-Portrait with Two Circles is different because the painter's profession is explicit. The tools make the hand important. They place Rembrandt in the act or condition of painting, even though he is not shown actively touching a canvas. He is both the maker and the subject. The painting looks outward, but it also looks back toward the studio.

That professional identity changes the emotional tone. It is tempting to read late Rembrandt as a story of loss: bankruptcy, household death, reduced social standing and old age. Those facts matter, but they are not enough for this picture. Rembrandt is not shown as defeated. He stands with the equipment of his art and before forms that ask to be understood as tests or claims. The painting turns biography into authority rather than complaint.

The pose is not courtly in the polished Renaissance sense, yet it carries dignity. The body is solid. The head is direct. The costume is painterly rather than fashionable. The tools are neither hidden nor overexplained. Rembrandt presents himself as someone whose identity is inseparable from making. He does not ask the viewer to admire wealth, youth or rank. He asks the viewer to confront the authority of practice.

The Problem of the Two Circles

The two circles are the painting's central mystery. They are visible enough to demand interpretation, but not clear enough to settle it. That balance has encouraged generations of viewers to look for a code.

One possibility is artistic mastery. A circle is one of the simplest forms and one of the hardest to draw perfectly by hand. Stories about artists proving their skill through a perfect circle go back to antiquity and Renaissance art writing. In that frame, Rembrandt may be measuring himself against an old idea of virtuoso control. The circles would become a sign that the painter can command form itself.

Another possibility is geometry or theory. Circles can suggest proportion, design, the intellectual side of art and the ordered world behind appearances. Rembrandt is often loved for rough surface, warm shadow and human presence, but he was not an anti-intellectual painter. His art repeatedly shows him thinking through tradition, composition and visual structure. The circles may therefore remind the viewer that painting is not only feeling or touch. It is also design.

A third possibility is studio practice. The circles may be marks on a wall, a surface, a canvas or a kind of practical exercise. They may evoke the painter's working environment rather than a symbolic system. That reading is attractive because the painting already identifies Rembrandt by his tools. The circles might belong to the world of making: measuring, practicing, testing, drawing and revising.

A fourth possibility is compositional. The circles may not need a single external reference. They shape the space around Rembrandt's head and body. They create tension between curved line and human form, between flat wall and living figure, between abstraction and likeness. Even if the viewer never solves their meaning, they make the picture feel larger than a portrait.

The best reading keeps these possibilities in play. The circles matter because they suggest mastery, theory, practice and structure without becoming only one of those things. Rembrandt gives us a form that invites thought and refuses closure.

A Late Self-Portrait

The late self-portraits are central to Rembrandt's modern reputation because they seem to bring the viewer close to age, endurance and artistic self-knowledge. But they should not be treated as simple confessions. Rembrandt's self-portraits are made pictures, not diary entries. They involve costume, pose, studio identity, market value, old-master memory and technical choice.

The 1659 Self-Portrait in the National Gallery of Art, Washington is a useful comparison. That painting, officially titled Self-Portrait, is often known by the beret and turned-up collar. The NGA catalogue places it in relation to earlier painterly models and records detailed technical evidence about ground layers, underpaint, impasto, incised hair and later treatment. It is grave, direct and deeply worked, but it does not present Rembrandt with the tools of his trade in the same explicit way as the Kenwood painting.

Self-Portrait with Two Circles pushes the late self-image into a more public professional statement. The Washington painting asks how an older painter can present dignity after crisis through face, costume and surface. The Kenwood painting asks how an older painter can stand before the viewer as a maker. The difference is subtle but important. One concentrates authority in the head and surface. The other sets the painter before signs of work and possible mastery.

The National Gallery, London Self Portrait at the Age of 63 adds another late example. It belongs to Rembrandt's final year and has often been read through age and mortality. Yet that painting too is art before it is biography. Across these late self-images, Rembrandt lets age enter the surface without surrendering the picture to decline. The older face becomes a way to show what paint, pose and looking can still do.

Biography Without the Myth of Defeat

By the mid-1660s Rembrandt had lived through public success, financial collapse, the loss of family members and changes in his social circumstances. It is natural to bring that history to Self-Portrait with Two Circles. The painting belongs to the same broad late world as works that modern viewers often read through endurance and loss.

But biography can become a trap if it turns the picture into an illustration of hardship. Rembrandt is not simply showing what life has done to him. He is constructing a self-image with painter's tools, a direct stance and challenging forms behind him. The painting does not deny age. It makes age part of authority.

That distinction matters because Rembrandt's late style is often romanticized. Rougher handling, darkness and the visible marks of age are sometimes treated as if they reveal inner suffering by themselves. They may carry emotional power, but they also belong to pictorial intelligence. Rembrandt knew how viewers read faces. He knew how costume, hand, shadow and background could shape response. He knew that a self-portrait could become a site for projection.

In this painting, the projection is especially tempting because the circles seem to promise a hidden meaning. The viewer wants to solve the symbols and then solve Rembrandt. The painting resists both desires. It gives enough evidence for serious interpretation, but not enough to collapse the work into one message.

The Face and Gaze

Rembrandt's face is not idealized. The traits are heavy, lived and alert. The viewer sees the signs of age, but the paint does not turn them into weakness. The face is modeled as a field of attention. Light catches the brow, nose, cheek and mouth; shadow gathers around the eyes and lower face; the cap presses the head into a darker frame.

The gaze is one of the reasons the painting feels so commanding. Rembrandt looks outward as if measuring the viewer. The expression is not theatrical. It has none of the wide-mouthed experimentation of the early tronies and none of the polished self-display of some earlier self-portraits. Its force comes from steadiness. The eyes do not ask for sympathy. They hold their ground.

That gaze changes how the circles work. If the circles were alone, they might become an exercise in geometry or symbolism. If the face were alone, the painting might become a late likeness. Together, they create a dialogue between person and form. Rembrandt stands before marks that seem abstract, measured or theoretical, yet his face pulls the viewer back to the human presence of the maker.

The result is not a choice between intellect and feeling. It is the fusion of both. The face gives the painting warmth and pressure. The circles give it difficulty and distance. The gaze holds them together.

Hand, Tools and Body

The hand and tools are easy to underread because the face and circles dominate discussion. Yet they are essential. They tell the viewer how Rembrandt wants to be understood. He is not only the subject of the painting. He is the person who makes paintings.

The tools also ground the image in work. A self-portrait can become theatrical, symbolic or psychological very quickly. Here the tools return the viewer to practice. Rembrandt's art depended on touch, preparation, revision, pigments, supports, brushes, knives, hands and trained judgment. The painting may ask large questions about mastery, but it does so through the ordinary fact of equipment held by a working artist.

The body reinforces that claim. It is broad, weighty and not especially elegant. Rembrandt does not stretch himself into aristocratic refinement. The garment is practical and painterly. The pose has dignity, but not fashionable polish. He seems to occupy the space as someone used to work rather than display.

This is one reason the painting has such authority. The self is not separated from labor. Rembrandt's identity is carried by face, hand, garment, tools and background together. He is an old man, a famous painter, a maker, a problem-setter and the visible product of decades of looking.

Paint Surface and Late Style

The available evidence for this painting is stronger on object history and interpretation than on detailed conservation study, so the surface should be read visually and in relation to Rembrandt's wider late style rather than through unsupported technical claims. What can be said securely is that the painting belongs to the late Rembrandt world in which broad handling, darkness, texture and selective finish become central.

Late Rembrandt often concentrates attention rather than finishing every passage to the same degree. Faces, hands, sleeves or illuminated edges may carry the greatest force, while surrounding areas remain broad or dark. That approach is visible across late paintings and is especially important for understanding why his self-portraits feel so immediate. The viewer sees a person and also sees the work of painting.

In Self-Portrait with Two Circles, the relation between figure and background is crucial. The circles are not polished architectural decoration. They feel close to the material act of marking. The figure itself is built from strong contrasts between illuminated flesh, darker costume and the pale circular forms behind him. The painting asks the eye to move from skin to cloth, from tool to circle, from face to surface.

This material force connects the work to the style and technique questions that run through Rembrandt's late career. Thick and thin paint, visible brushwork, dark grounds, selective focus and the tension between finished and unfinished passages all help create presence. In the Kenwood painting, presence is not only likeness. It is the sensation of a maker standing in front of the signs of making.

Kenwood and the Iveagh Bequest

The Kenwood context is part of the painting's modern identity. The work came through the Iveagh Bequest, the collection given by Edward Cecil Guinness, first Earl of Iveagh. That gift made Kenwood a major public home for old-master painting, and Self-Portrait with Two Circles became one of its best-known treasures.

The bequest context also affects how the painting is encountered. A Rembrandt self-portrait in an English country-house setting has a different public history from a painting in a Dutch national museum or a specialist print room. Kenwood presents the work within a collection shaped by private collecting, national gift and public access.

That does not change what Rembrandt painted in the 1660s, but it changes the painting's later life. The work has been seen, written about and reproduced through the identity of Kenwood. English Heritage's treatment of it as a key portrait and collection highlight has helped make it a familiar route into Rembrandt's late self-fashioning for modern readers.

The object records also show how a painting's modern administration becomes part of its story. English Heritage, Art UK, Google Arts & Culture and CODART do not all present every field in the same way. Title, measurement, image rights and display information can vary by record type. A careful reader should use those records as complementary evidence rather than flattening them into one careless summary.

The Circles and Old Stories About Artistic Mastery

One of the most attractive interpretations connects the circles with old stories of artistic skill. In art-historical tradition, the ability to draw a perfect circle by hand could stand for extraordinary mastery. The anecdote most often invoked in broader art writing concerns Giotto, who was said to have demonstrated his skill by drawing a perfect circle.

It is understandable why this reading has stayed attached to Rembrandt's painting. The circles are huge, simple and difficult. Rembrandt stands with painter's tools. A viewer who knows the old story may see the circles as a challenge: here is the old master measuring himself against a legendary test of hand and judgment.

Yet caution is necessary. The painting does not include an inscription explaining the circles. It does not show Rembrandt drawing them. They are not perfect laboratory diagrams. Their incompletion and placement make them stranger than a straightforward boast. If the old artistic-mastery tradition is relevant, Rembrandt has transformed it into something more ambiguous.

That ambiguity may be the point. A perfect-circle story celebrates skill as proof. Rembrandt's painting presents skill as a question. What does mastery look like in old age? Is it clean geometry, human presence, visible labor, self-knowledge, or the ability to hold all of those things in one unresolved image? The painting does not answer with a slogan. It stages the problem.

Geometry, Theory and the Human Figure

The circles also suggest geometry, and geometry has long belonged to the intellectual status of art. A painter who understands proportion, form and spatial relation is not merely copying appearances. He is ordering them. In that sense, the circles may place Rembrandt's self-portrait in conversation with the theory of painting itself.

This is important because Rembrandt is sometimes treated as the painter of feeling against rule, touch against intellect, roughness against polish. That contrast is too simple. His art is full of feeling, but it is also rigorously composed. The Night Watch organizes a crowd through light and movement. The 1632 Tulp group portrait turns a medical guild picture into a hierarchy of looking. The Jewish Bride uses thick paint and restrained gesture to create emotional force. Self-Portrait with Two Circles uses a few large elements - figure, tools, gaze, circles - to make a picture of extraordinary compression.

The circles may therefore remind us that Rembrandt's late looseness is not lack of structure. The figure is set against abstract order. The human body and face are measured against curved form. The hand that holds the tools also belongs to the body that might make such forms. The painting asks whether the painter's authority lies in geometry, in touch, in likeness, or in the ability to bring them together.

This reading does not require the circles to mean one exact doctrine. Their value is broader. They make the portrait think visibly.

Studio Practice and the Everyday Test

A more down-to-earth reading sees the circles as linked to studio practice. Artists practice forms. They test surfaces. They measure and revise. They work on walls, boards, canvases, grounds and paper. In that frame, the circles may belong less to grand symbolism and more to the visible world of making.

This reading fits the tools. Rembrandt appears not as a gentleman surrounded by luxury, but as a painter with the equipment of his craft. The circles behind him may be exercises, marks, traces or challenges. They might turn the background into a studio surface rather than a symbolic backdrop.

The advantage of this reading is that it keeps the painting close to work. Rembrandt's art was made through repeated practice, not through inspiration alone. He studied faces, light, costume, bodies, prints, drawings, pigments and surfaces for decades. A circle can be a philosophical form, but it can also be something a hand tries to make.

The limitation is that the painting itself remains too charged to be reduced to a practical studio note. The circles are too large and prominent to feel accidental. They may refer to practice, but they also lift practice into meaning. Rembrandt turns an everyday test into a public image of the painter's identity.

A Self-Portrait About Looking

Self-Portrait with Two Circles is often discussed as a picture about painting, but it is also a picture about looking. The viewer looks at Rembrandt; Rembrandt looks back; the circles ask the viewer to look behind him; the tools ask the viewer to imagine the act of making. The painting keeps redirecting attention.

That movement is one of Rembrandt's great strengths. He rarely lets the viewer rest in one kind of seeing. A face becomes paint. A costume becomes role. A biblical scene becomes a study of light. A print becomes a particular impression on a particular sheet. Here, a self-portrait becomes a meditation on the conditions of self-portraiture.

The circles are essential to that movement because they interrupt the usual expectations of portraiture. A viewer might expect background, architecture, curtain, studio object or landscape. Instead, Rembrandt gives two curved forms that are at once simple and baffling. They make the viewer ask what is being measured: the figure, the painter's skill, the viewer's interpretation, or art itself.

The answer may be all of them. The painting is not a puzzle with one hidden solution. It is a structure that keeps looking alive.

Place Within Rembrandt's Self-Portraits

Rembrandt made self-portraits across much of his career and across several media. Some are painted likenesses. Some are etched images that circulated among collectors. Some early works come close to tronies, studies of character or expression rather than conventional portraiture. The self-portrait group as a whole is hard to count because attribution, medium and definition all matter.

Within that group, Self-Portrait with Two Circles has a special role. It is not the earliest, not the most technically documented, and not the final self-image. Its importance lies in how directly it connects self-portraiture with artistic status. Rembrandt does not only show what he looks like. He shows what he is.

The 1659 Washington self-portrait can stand for late inward concentration. The National Gallery, London Self Portrait at the Age of 63 can stand for final-year directness. The Kenwood painting stands for the artist facing the problem of art itself. That is why it belongs with the broader self-portraits page, the late biography page and the style and technique page. It sits at the point where likeness, career, material handling and artistic theory meet.

It also belongs with the paintings page because it is a major late canvas, not just a biographical document. Readers should resist treating it as a portrait illustration for Rembrandt's life story. It is one of the works through which that life became art.

Why the Painting Matters

Self-Portrait with Two Circles matters because it makes artistic identity visible without making it simple. Rembrandt stands with tools, but the painting is not merely occupational. He stands before circles, but the circles are not merely symbols. He shows age, but the painting is not merely about old age. He looks at the viewer, but the gaze is not merely psychological.

The painting matters also because it refuses the easiest late-Rembrandt myth. It does not show an artist broken by life, retreating into private confession. It shows an old painter asserting presence through the very terms of painting: hand, face, tool, surface, form and uncertainty.

Its grandeur is unusually quiet. There is no crowd, no biblical drama, no violent action and no elaborate costume display. The drama is intellectual and visual. The viewer stands before a man who has spent his life making images and now appears before forms that seem to ask what mastery is.

That question remains open. The circles may allude to skill, geometry, theory, studio practice or composition. They may do several of these things at once. Their refusal to settle is not a weakness. It is what keeps the painting alive.

How to Read Self-Portrait with Two Circles

Start with the object facts: Rembrandt van Rijn, around 1665, oil on canvas, Kenwood / English Heritage / Iveagh Bequest, with framed and unframed dimensions carefully distinguished in the English Heritage / Google Arts route. This prevents the painting from floating free as a famous image without a material record.

Then look at the painter's body. Notice the breadth of the stance, the weight of the garment, the hand and tools, and the way the face holds the composition. Ask how Rembrandt identifies himself. The answer begins with profession, not sentiment.

Next, look at the circles without trying to solve them too quickly. Ask what they do visually before asking what they mean symbolically. They frame, challenge, balance and disturb the portrait. They bring abstract form into contact with a human presence. They make the background active.

Finally, return to the face. The painting is not a geometry lesson with a portrait attached. It is a self-portrait in which geometry, studio practice and artistic legend may all gather around a living maker. Rembrandt's achievement is to keep the human and the theoretical in one field of vision.

That is why Self-Portrait with Two Circles remains one of the great late self-images. It does not tell us exactly what Rembrandt thought about himself. It shows him constructing an image capable of sustaining that question.

Frequently Asked Questions About Rembrandt's Self-Portrait with Two Circles

Where is the painting associated with today?

The painting is associated with Kenwood through the English Heritage / Iveagh Bequest route. Art UK records Kenwood and English Heritage ownership and notes acquisition through the Iveagh Bequest in 1929.

What is the medium?

The painting is oil on canvas.

What are the dimensions?

The English Heritage / Google Arts & Culture partner record gives framed dimensions of 143.5 x 125.2 x 12.7 cm and unframed dimensions of 114.3 x 94.0 x 1.0 cm. Other records vary slightly, so framed and unframed measurements should not be confused.

What do the two circles mean?

The circles have been linked to artistic mastery, geometry, theory, studio practice, compositional structure and old stories about artists proving skill through circles. None of these readings should be treated as certain. Their unresolved quality is part of the painting's force.

Is the painting a simple reflection of Rembrandt's old age?

No. It belongs to Rembrandt's late self-portraiture, but it is not simply a confession or image of decline. It presents Rembrandt as a painter, with tools and challenging forms behind him, making artistic authority the central issue.

Discussion

What feels most important in Rembrandt Self-Portrait with Two Circles: Rembrandt's light, the figure's expression, the material surface, the historical source, or the way the work sits beside his other paintings and prints?

Reader Insights

Close Looking

Begin with one detail in Rembrandt Self-Portrait with Two Circles, then move outward to light, gesture, surface and the surrounding space.

Context

Connect the work to Rembrandt's biography, workshop, medium and the museum record rather than reading it as an isolated image.

Open Question

Which detail changes the interpretation most once you know the date, subject, attribution history or present collection?

Join the Conversation

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References

  1. English Heritage, Kenwood Rembrandt self-portrait route: https://production.english-heritage.org.uk/visit/places/kenwood/history-stories-kenwood/rembrandt-self-portrait/
  2. English Heritage, Face to Face: https://www.english-heritage.org.uk/visit/inspire-me/face-to-face-english-heritage-through-portraits-at-our-properties/
  3. English Heritage, The Iveagh Bequest: https://www.english-heritage.org.uk/visit/places/kenwood/history-stories-kenwood/the-iveagh-bequest/
  4. English Heritage / Google Arts & Culture, Portrait of the Artist: https://artsandculture.google.com/asset/portrait-of-the-artist-rembrandt-van-rijn/QgHkNBGhrxU0Ww?hl=en
  5. Art UK, Self Portrait with Two Circles: https://artuk.org/discover/artworks/self-portrait-with-two-circles-191815
  6. CODART Canon, Self-Portrait with Two Circles: https://canon.codart.nl/artwork/self-portrait-2/
  7. National Gallery of Art, Washington, Self-Portrait, 1659: https://www.nga.gov/artworks/79-self-portrait
  8. National Gallery of Art, Washington, Arthur K. Wheelock Jr., Rembrandt van Rijn, Self-Portrait, 1659, in Dutch Paintings of the Seventeenth Century: https://www.nga.gov/research/publications/dutch-paintings-seventeenth-century/rembrandt-van-rijn-self-portrait-1659
  9. National Gallery, London, Self Portrait at the Age of 63: https://www.nationalgallery.org.uk/paintings/rembrandt-self-portrait-at-the-age-of-63
  10. Rembrandt Database, mission and scope: https://rembrandtdatabase.org/about/mission-and-scope.html
  11. Rembrandt Database, A Corpus of Rembrandt Paintings: https://rembrandtdatabase.org/literature/corpus.html