Guido di Graziano

Guido di Graziano was an Italian painter and manuscript illuminator active in Siena between approximately 1278 and 1302, widely regarded as one of the pivotal figures in the formation of the Sienese School of painting in the late thirteenth century. Though his precise dates of birth and death remain unknown, documentary evidence places his artistic activity firmly within the final quarter of the Duecento, making him a near-contemporary of Duccio di Buoninsegna and a crucial, if somewhat shadowy, predecessor to the great flowering of Sienese art in the Trecento.

Family background

Guido di Graziano was born in Siena, almost certainly in the second quarter of the thirteenth century, though no precise date is preserved in the archival record. His surname, derived from his father’s Christian name Graziano, follows the standard patronymic convention of medieval Tuscan nomenclature and tells us little beyond the fact that his father belonged to the artisan or professional class of the Sienese popolo. The family’s roots appear to have been established within the terzo di Camollia, one of the three administrative divisions of the commune of Siena, for a document of 1285 identifies Guido as belonging to the lira of San Donato¹, a fiscal and administrative unit within that district. This geographical identification provides one of the few anchors by which the artist’s social world can be mapped onto the physical fabric of his native city, placing him in the dense urban fabric of northern Siena rather than in the artisan quarters closer to the cathedral.

What is particularly remarkable about Guido’s family context is that painting was, in his household, a genuinely familial profession. The documentary record mentions two brothers who were also painters: Meo and Guarnerio, both of whom collaborated with Guido on at least one commission for the Biccherna², the financial magistracy of the Sienese commune, in the second semester of 1284. This fraternal workshop arrangement, while not unique in medieval Italy, speaks to a household economy organised around the craft of painting, in which skills and workshop traditions were transmitted within the family unit and contracts were sometimes held collectively. The fact that Guarnerio is mentioned in immediate proximity to Guido in the 1285 fiscal record suggests that the two brothers may have shared a common workshop address or at least resided in close proximity within the same lira.

The existence of a family workshop of this kind implies that Guido’s training began at home, most likely in his father’s or an elder brother’s atelier, before any formal apprenticeship outside the family circle could have been undertaken. In medieval Siena, the transmission of painting skills within family workshops was a common mechanism for the perpetuation of craft knowledge, and the evidence of three brothers all practicing as painters simultaneously suggests a household that had accumulated sufficient social capital and technical knowledge to sustain multiple independent careers within the same trade. This familial dimension of Guido’s professional life has often been overlooked by scholars who, focusing on the attribution of individual works, have tended to treat him as an isolated artistic personality rather than as a member of a coherent family enterprise. The fraternal collaboration on the Biccherna cover of 1284 is, in this respect, particularly illuminating, for it shows that the brothers were capable of presenting themselves jointly to a major civic patron and executing a commission collectively.

Beyond the immediate nuclear family, Guido di Graziano’s social world was shaped by the guilds and confraternities that structured Sienese civic life. Painters in thirteenth-century Siena were organised within broader craft guilds, though the specific guild to which Guido belonged has not been conclusively identified in the surviving documents. His repeated employment by the Biccherna suggests that he was regarded by the commune as a reliable, established craftsman with a good professional reputation, which in turn implies that he had successfully navigated the guild structures that regulated access to civic patronage. The fiscal records that mention him by name — as Guidone of the lira of San Donato — confirm that he was a recognized, tax-paying member of the Sienese artisan community, not a transient or marginal figure but a householder with a fixed address and a stable professional identity.

The question of Guido’s death remains, like his birth, without a precise answer in the documentary record. The last payment traceable to a painter named Guido in the Sienese Biccherna registers dates to 1302, and scholarship has generally assumed that Guido di Graziano died shortly after this date, perhaps in the early years of the fourteenth century. He was thus a painter who lived and worked entirely within the thirteenth century in terms of his artistic formation, even if a few years of activity may have extended beyond 1300. The cause of death is unknown; given the period, plague, endemic infections, or the ordinary toll of age are equally plausible, and no chronicle or memorial inscription has come to light that would provide more specific information. His legacy passed not through biological heirs but through artistic influence, and it is in the subsequent generation of Sienese painters that the echoes of his style and manner can be most clearly detected.

Patronage and Civic Commissions

The most consistently documented aspect of Guido di Graziano’s career is his relationship with the Sienese commune and its financial administration, the Biccherna. This institution, responsible for managing the revenues and expenditures of the city-state of Siena, maintained a tradition of commissioning painted covers (tavolette) for its bound registers of accounts, a practice that combined administrative record-keeping with a form of civic visual culture. These covers, small in format but carefully executed, typically depicted the presiding official (camarlingo) — often a monk from one of the city’s great abbeys — in the act of managing funds, and they served both as identifiers for the registers and as modest monuments to the dignity and probity of the commune’s financial officers. Guido di Graziano’s name appears in these records repeatedly, establishing him as one of the principal painters employed by the Biccherna between 1278 and 1302.

The earliest confirmed payment to Guido by the Biccherna dates from the registers themselves: he is recorded as receiving payment for the decoration of the camerlingo’s books and those of the four provveditori in a series of entries spanning the biccherne of January–June 1280, July–December 1286, January–June 1288, January–June 1289, and July–December 1290. These were not trivial commissions; the Biccherna registers were public documents of civic importance, and the painters entrusted with their covers were expected to produce works of sufficient quality to reflect well upon the dignity of the commune. Guido’s repeated engagement for these commissions over more than a decade demonstrates both the trust the civic administration placed in him and the regularity with which he was available to fulfill institutional demands. The payments also indicate that his role extended beyond panel painting to encompass the decoration of notarial books and standards (vessilli), pointing to a versatile workshop capable of fulfilling a range of civic commissions.

The single surviving example of these Biccherna covers attributable to Guido with documentary certainty is the Tavoletta di Biccherna con Don Guido Monaco di San Galgano (first semester of 1280), now preserved in the Archivio di Stato in Siena. This small but refined panel depicts the Cistercian monk Don Guido of the Abbey of San Galgano in his role as camerlingo, seated at a counting table in the act of managing the commune’s finances. The work is of exceptional importance not only as a document of civic patronage but as the foundational piece from which Luciano Bellosi, in his landmark study of 1991, reconstructed the entire corpus of Guido di Graziano’s attributed works. Without this documented panel, the artist would be little more than a name in an archive; it is precisely the connection between the signed documentary evidence and the distinctive stylistic features of this small work that enabled Bellosi to assign to Guido a group of much larger and more ambitious panels, including the Dossale di San Pietro.

In addition to the Biccherna, Guido di Graziano was employed by the Sienese commune for more prestigious decorative commissions. Two now-lost frescoes in the Palazzo Pubblico — the seat of the city’s government — are recorded as his work: a Maestà (an enthroned Virgin and Child in majesty) and an image of the Santi Pietro e Paolo. These frescoes, had they survived, would have represented among the most significant civic commissions of thirteenth-century Siena, for the Palazzo Pubblico was not merely an administrative building but the symbolic heart of Sienese republican identity. The loss of these works deprives us of what might have been our clearest evidence for Guido’s capabilities on a monumental scale, and it significantly complicates any attempt to reconstruct the full range of his artistic output. Their existence, however, confirms that by the time of their execution Guido had risen to the very summit of civic patronage in Siena

The ecclesiastical patronage that sustained Guido’s career is visible primarily through the surviving panel paintings attributed to him by modern scholarship. The Dossale di San Pietro almost certainly originated as a commission from the church of San Pietro in Banchi in Siena, a now-destroyed institution whose dedication to the Prince of the Apostles explains the altarpiece’s programme. Similarly, the large altarpiece depicting San Francesco e storie della sua vita originated as a commission for the church of San Francesco in Colle di Val d’Elsa, a Franciscan foundation that required an image appropriate to the order’s programme of visual evangelisation. These commissions reveal the dual character of Guido’s patronage base: on one hand, the civic and financial institutions of the commune; on the other, the ecclesiastical foundations, both Benedictine and mendicant, that were reshaping the religious landscape of Tuscany in the second half of the Duecento. The Franciscans in particular were enthusiastic patrons of panel painting, recognising in the narrative altarpiece a powerful tool for communicating the life and miracles of their founder to congregations that were largely illiterate.

The Cistercian monastery of San Galgano, whose abbot provided the camarlingo depicted in the 1280 Biccherna cover, was another institution that shaped Guido’s patronage world in ways that extended beyond the single documented panel. San Galgano was one of the most powerful and wealthy monastic establishments in Tuscany during the thirteenth century, and its monks frequently served in the financial administration of the Sienese commune, creating a sustained institutional link between the abbey and the city’s government. Guido’s employment to paint the San Galgano camarlingo thus places him within a network of patronage that connected civic, Cistercian, and local ecclesiastical interests, and it is entirely plausible that further commissions from the abbey or its affiliated churches were part of his working career, even if they left no surviving trace in the documentary record.

Painting Style

Guido di Graziano’s painting style is rooted in the Byzantine tradition that dominated central Italian art throughout the thirteenth century, but it is distinguished by a subtle inflection toward greater naturalism and spatial coherence that marks it as transitional rather than merely conservative. His figures retain the elongated proportions, the gold-hatched drapery, the hieratic frontality, and the almond-shaped eyes characteristic of the maniera greca, yet they are handled with a delicacy and a psychological attentiveness that set them apart from the more rigid formulas of earlier Italo-Byzantine painting. The faces in particular are drawn with a fineness of line and a sensitivity to individual character that contemporaries and later critics alike found to be among the most distinguished qualities of the Sienese school before Duccio. This capacity to individualise within the constraints of a conventionalised system is one of the most important features of Guido’s mature style.

The spatial organisation of Guido’s panels reflects a transitional moment in the history of Italian painting, when the flat, gold-ground world of Byzantine icon painting was beginning to be articulated by tentative gestures toward pictorial depth and architectural setting. In the Dossale di San Pietro, for example, the throne on which the apostle sits is rendered with a slight sense of three-dimensionality that gives the central figure a convincing physical presence within the panel, even as the gold ground behind and above it remains resolutely non-spatial. This calibrated use of architectural framing — arches, columns, miniature towers — to define a pictorial stage for the sacred figures is one of Guido’s most characteristic compositional strategies, and it appears consistently across the works attributed to him by modern scholarship. The device was not invented by Guido, but he employs it with a consistency and an elegance that distinguishes his work from that of his more formulaic contemporaries.

In the treatment of drapery, Guido demonstrates a mastery of the Italo-Byzantine system of gold highlighting (chrysography) that is both technically accomplished and aesthetically refined. The folds of his figures’ garments are rendered through a system of fine gold striations laid over richly coloured grounds — deep reds, lapis blues, and verdigris greens — that create a surface of considerable luminous intensity. This use of colour is not decorative in a superficial sense but is instead functionally iconic: the gold highlights dematerialise the physical body beneath the garment, elevating the represented figure to a register of sacred timelessness that transcends the contingencies of earthly material existence. The colour choices themselves — particularly the deep crimson and the intense blue — follow the established conventions of Byzantine iconography for the depiction of apostles and sacred figures, but Guido handles these conventions with a freedom and a confidence that suggests a painter fully in command of his technical resources.

The narrative panels that surround the central devotional image in Guido’s altarpieces reveal a distinctive approach to the challenge of storytelling within the constraints of a hierarchical altarpiece format. In the Dossale di San Pietro, the six narrative scenes arrayed around the central enthroned figure — the Annunciation, the Nativity, the Calling of Saint Peter, the Liberation of Saint Peter from Prison, the Fall of Simon Magus, and the Martyrdom and Death of Saint Peter — are rendered with a compactness and an economy of means that is nonetheless capable of conveying narrative movement and emotional intensity. The figures in these scenes are smaller in scale than the central devotional image, but they are not summary in execution; each scene is carefully composed to communicate the essential dramatic moment, and the faces of the protagonists are individualised with the same attentiveness that characterises the central figure. This balance between hierarchical scale and narrative vividness is one of the defining achievements of Guido’s mature altarpiece style.

The San Francesco e storie della sua vita altarpiece, measuring 237 by 113 centimetres in its full extent, demonstrates the broader range of Guido’s narrative capabilities. The large central figure of Saint Francis — depicted in the grey-brown habit of the Franciscan order, standing against a gold ground with the wounds of the stigmata visible on his hands and feet — is surrounded by a series of narrative tabelloni illustrating episodes from the saint’s life, including his reception of the stigmata, his preaching to the birds, and his appearance before the Crucifix of San Damiano. These scenes are among the most accomplished narrative paintings produced in Sienese art before Duccio, and they demonstrate Guido’s capacity to adapt the conventions of Franciscan hagiographic illustration — developed in central Italy from the mid-Duecento onward — to a format and a visual language that was specifically Sienese in character. The birds that listen to Francis’s preaching are rendered with an observed naturalism entirely consistent with the Franciscan celebration of the natural world as a manifestation of divine creation.

The handling of the golden ground in Guido’s panels is technically sophisticated and reflects a mastery of the gilding techniques common to Italian panel painting of the period. The gold is applied over a bolo (red clay) preparation that gives it a warm, slightly reddish glow distinguishable from the cooler, more brilliant gold grounds associated with some Florentine workshops of the same period. The punched and incised decorations within the gold ground — halos, architectural ornament, and the decorative fields surrounding the figures — are executed with a precision and a variety of patterning that testify to the availability within Guido’s workshop of a full range of professional tools and techniques. This technical richness contributes to the overall impression of luxurious craftsmanship that characterises his surviving works and would have made them highly desirable to the ecclesiastical patrons who commissioned them.

The question of Guido’s relationship to the art of illuminated manuscripts — the other major medium in which his name appears in the documents — is complicated by the near-total loss of the manuscripts themselves. The Sienese communal records indicate payments to Guido for the decoration of books, and he is described in some modern scholarship as both a painter and a miniatore (illuminator), suggesting that his workshop was capable of producing work in both media. The relationship between panel painting and manuscript illumination in thirteenth-century Siena was close and mutually reinforcing: the same formal conventions, the same decorative vocabulary, and often the same gold-ground technique were employed in both, and painters regularly moved between the two media according to the demands of their patrons. If Guido’s work in manuscripts resembled his panel painting in its fineness of execution and its delicate approach to the human figure, it would have been among the finest Sienese illumination of the late Duecento.

Artistic Influences

The most profound and pervasive influence on Guido di Graziano’s artistic formation was the Byzantine pictorial tradition as it had been received, transformed, and transmitted in central Italy across the twelfth and thirteenth centuries. This tradition, rooted in the icon-painting conventions of the Greek East and mediated through the workshops of itinerant Greek and Italo-Greek painters, established the formal vocabulary — the gold ground, the frontal hieratic pose, the gold-hatched drapery, the elongated proportions, the spiritualised facial types — within which all Sienese painters of the Duecento necessarily worked. For Guido, as for his contemporaries, this was not a static or limiting inheritance but a living tradition capable of accommodating considerable individual variation, and his particular contribution was to inflect these conventions in the direction of a greater naturalism and psychological depth without abandoning their theological and aesthetic logic. The maniera greca was for Guido not a cage but a grammar, and he was among the first Sienese painters to begin expanding its expressive range.

Within Siena itself, the most immediately formative influence on Guido was almost certainly Guido da Siena, the older painter whose name causes persistent confusion in the scholarship but whose artistic personality was sufficiently distinct. Guido da Siena, active in the mid-to-late Duecento, established the foundational conventions of Sienese altarpiece painting, particularly the monumental seated Madonna in Maestà type, and his work defined the visual horizon within which the younger painter developed his own style. The Dossale di San Pietro reveals the assimilation of Guido da Siena’s compositional strategies — the throne set within a trilobed arch, the flanking angels, the hierarchical arrangement of narrative scenes — even as the quality of execution and the handling of individual faces shows a sensibility that is distinctly Guido di Graziano’s own. The relationship between the two painters has sometimes been characterised as that of master and pupil, though the documentary evidence for direct transmission of skills from one to the other is lacking.

The influence of Cimabue, the great Florentine master who revolutionised Italian painting in the second half of the Duecento, is clearly visible in Guido’s surviving works and has been specifically noted by modern critics in relation to the Dossale di San Pietro. Cimabue’s synthesis of Byzantine formality with a new monumentality and a more convincing rendering of three-dimensional form was the single most transformative influence on Italian painting between the mid-Duecento and the emergence of Giotto, and its reach extended well beyond Florence to shape the work of painters throughout central Italy, including Siena. In Guido’s case, the Cimabue influence manifests most clearly in the increased weight and physical presence of his figures, in the more complex spatial articulation of the throne and architectural setting, and in a certain grandeur of conception that elevates his altarpieces above the more routine productions of the Sienese workshops of the period. The strong Cimabue-like qualities of the Dossale di San Pietro initially led critics to attribute the work to an anonymous Maestro del dossale di San Pietro, distinct from all known Sienese painters, before Bellosi’s definitive attribution to Guido.

The Franciscan tradition of hagiographic altarpiece painting, developed in Umbria and Tuscany from the mid-Duecento onward, was another crucial influence on Guido’s approach to narrative imagery. The Franciscan altarpiece type — with a large central image of the saint flanked by or surrounded by narrative scenes from his life — was established by Bonaventura Berlinghieri and his circle in Lucca and subsequently adopted and adapted by painters throughout Tuscany and Umbria. Guido’s San Francesco e storie della sua vita is deeply indebted to this tradition, and its narrative tabelloni show a familiarity with the Franciscan iconographic programme that must have been acquired either through direct study of earlier examples or through the mediation of the Franciscan friars themselves, who were active commissioners of this type of imagery throughout the second half of the Duecento. The choice of specific episodes — the stigmatisation, the preaching to the birds, the vision of San Damiano — reflects the standard hagiographic programme codified by Bonaventura of Bagnoregio³ in his Legenda Maior of 1263.

The artistic community of Siena in the 1270s and 1280s was a remarkably fertile environment, and Guido di Graziano’s development was shaped not only by the dominant figures already mentioned but by the collective exchange of ideas and techniques within the local workshop community. His collaboration with his brothers Meo and Guarnerio on the Biccherna cover of 1284, as well as his engagement with the same civic and ecclesiastical patrons who employed Dietisalvi di Speme and other Sienese painters of the generation, implies a sustained exposure to the work of his contemporaries and a degree of professional interaction that would inevitably have shaped his own artistic choices. The Siena Cathedral complex — where frescoes by Guido da Siena, Dietisalvi di Speme, Guido di Graziano, and Rinaldo da Siena are now known to have once decorated the walls of the crypt — was a site of direct artistic exchange, where the same walls brought the work of multiple painters into immediate visual dialogue.

Travels and Geographic Range

The question of Guido di Graziano’s travels is one on which the documentary evidence is almost entirely silent, and any reconstruction of his geographic movements must therefore be largely inferential, grounded in comparisons of style and in the known circumstances of his commissions. What is certain is that he was active primarily in Siena throughout the documented period of his career, receiving payments from the Sienese Biccherna at regular intervals from 1278 to 1302. This sustained civic relationship implies a painter who maintained a permanent workshop in the city and who was physically present to fulfil commissions as they arose, rather than an itinerant artist who moved from centre to centre in search of patronage. The regularity and frequency of the Biccherna payments in particular — spanning more than two decades — is difficult to reconcile with extended absences from Siena, and it suggests a career anchored firmly in the city of his birth.

Nevertheless, the broader artistic influences visible in Guido’s work — particularly the Cimabue-like qualities noted by critics in relation to the Dossale di San Pietro — raise the question of whether he ever visited Florence or other Tuscan centres where the innovations of Cimabue and his circle would have been directly accessible. Cimabue was active in Florence, Rome, and Assisi during the 1270s and 1280s, and the great basilica of San Francesco at Assisi — where Cimabue executed his most monumental frescoes — was a site of pilgrimage and artistic education for painters throughout central Italy during this period. It is entirely plausible that Guido made one or more journeys to Assisi, either as a pilgrim or specifically to study the new monumental painting being produced there, and that these encounters with the latest Florentine and Roman developments fed directly into the evolution of his own style during the 1280s.

The commission for the San Francesco e storie della sua vita altarpiece, originating from the church of San Francesco in Colle di Val d’Elsa — a town some thirty kilometres north-west of Siena, situated between Siena and Florence on the ancient Via Francigena — implies at minimum a physical journey to deliver the completed work, and possibly also preliminary visits to the commissioning community to discuss the programme and the format of the altarpiece. Colle di Val d’Elsa was a prosperous centre of the Val d’Elsa, known in the later Middle Ages for its glass and metalworking industries, and its Franciscan community would have had both the financial resources and the cultural ambition to commission a large-format narrative altarpiece of the kind Guido produced. The journey from Siena to Colle di Val d’Elsa along the Via Francigena would have passed through territory that was itself richly endowed with works of art, providing Guido with further opportunities for the kind of visual education that the roads of medieval Tuscany regularly offered to travelling craftsmen.

The participation of Guido di Graziano — alongside Guido da Siena, Dietisalvi di Speme, and Rinaldo da Siena — in the decoration of the crypt of the Siena Cathedral is now confirmed by the rediscovery and attribution studies that followed the dramatic reopening of that space in 1999. The collaboration of multiple painters on a single monumental ensemble of this kind implies a degree of organisational coordination that may have involved visits to workshops, shared cartoon preparation, and the physical movement of painters and their assistants within the building over an extended period. Whether this constituted “travel” in any meaningful sense is debatable, but it does suggest that Guido’s working world was not confined to his private atelier and that he was accustomed to operating within collaborative, multi-artist environments that extended beyond the walls of his own workshop.

Principal Works and Their Content

Dossale di San Pietro

Guido di Graziano’s Altarpiece of St. Peter is considered the masterpiece of Sienese painting prior to Duccio, a work that masterfully synthesizes the local tradition and the figurative innovations of the late 13th century in Italy.

The altarpiece—a horizontal rectangular format derived from the antependium, that is, the panel placed in front of the altar—is divided into three main panels by gilded, rounded frames. At the center, in a dominant position, stands the monumental figure of Saint Peter Enthroned, flanked on either side by two narrative panels containing a total of six scenes from the saint’s life.

The central figure is framed by a trefoil arch with angels in the spandrels, a decorative solution that lends hierarchical solemnity to the entire composition. The technique is tempera and gold on panel: the gilded background, in gold leaf, creates that immaterial and absolute light typical of the Byzantine-Sienese tradition, in which the figures seem suspended outside of time and physical space.

The seven images:

• Saint Peter Enthroned (central panel)

Saint Peter is seated on a precious throne, wrapped in a wide purple-red mantle that covers a blue tunic. In his right hand he holds the keys to Paradise—an unmistakable iconographic attribute—and in his left a scroll, symbol of his apostolic preaching. On either side of the trefoil arch framing the scene appear two half-length angels with their hands raised in a gesture of adoration. The solemn, frontal pose, the controlled gestures, and the fixed gaze directly recall the tradition of the Byzantine icon, filtered through the Sienese school. The identifying inscription S. Petrus is legible on the frame.

• Annunciation (side panel, top left)

The scene depicts the Archangel Gabriel announcing to Mary her divine calling. The figures face each other within a simplified architectural setting of towers and arches, rendered in the vivid colors—red, green, blue—typical of the Sienese school. Mary appears in her classic receptive iconography, with her head slightly bowed. The angel, with outstretched wings and an eloquent hand gesture, represents the heavenly message. The gold of the background unifies the two figures, placed in a sacred and otherworldly realm.

• Nativity (side panel)

The scene of the Nativity includes both the birth of Jesus, with the Child swaddled in the manger, and secondary scenes typical of medieval iconography, such as the Annunciation to the Shepherds and the Washing of the Child. The composition follows the tradition of Sienese narrative scenes, where secondary characters—the midwives, the shepherds—enrich the Gospel narrative with stylized details of daily life.

• The Calling of Saint Peter and Saint Andrew (side panel)

Christ appears on the shores of Lake Tiberias and calls Peter and his brother Andrew while they are fishing. The scene visually renders the Gospel passage (Mt 4:18–20): the two brothers, nets in hand, turn toward the figure of Christ, who beckons them with a gesture of his arm. The boat, the lake, and the figures compose a linear narrative in which the compositional simplicity is typical of 13th-century Sienese painting, where the essentiality of the story prevails over spatial depth.

• The Release of Saint Peter from Prison (side panel)

The Angel of the Lord descends into the prison in Jerusalem where Peter is being held captive and, touching him on the side, awakens him from sleep and frees him from his chains (Acts 12:7). The scene shows Peter asleep among the guards, with the luminous angel breaking the darkness of the prison with his presence. The contrast between the winged figure of the angel and the heavy, bound figure of the prisoner creates an effective narrative polarity.

• The Fall of Simon Magus (side panel)

This is one of the most dramatically intense scenes in the entire altarpiece. Simon Magus, the magician who, according to the Acts of Peter, had challenged the apostle before Emperor Nero by attempting to fly with the help of the devil, falls to the ground just as Peter begins to pray. In the composition, demons are seen desperately trying to hold him back as he falls, but the miracle is inevitable. The architectural elements colored in almost acid-like hues—pink, light blue, pale yellow—lend the scene an almost supernatural dimension, alluding to the miraculous nature of the event. The figure of Simon Magus, contorted in his upside-down flight, is one of the first such dynamic representations in 13th-century Sienese painting.

• Martyrdom and Death of Saint Peter (side panel)

The final scene depicts the martyrdom of Peter, crucified upside down on Vatican Hill at his own request, as he did not consider himself worthy of dying in the same posture as Christ. The inverted crucifixion is one of the most powerful iconographic elements in the hagiography of Peter, and Guido di Graziano renders it with the stylistic restraint that characterizes the entire panel. The presence of onlookers and executioners completes the narrative, set within a simplified architectural setting in accordance with the formal language of the late 13th-century Sienese school.

The panel reveals a dual influence: on the one hand, the Sienese school of Guido da Siena with its refined linearity and rich color palette; on the other, the powerful influence of Cimabue, the Florentine master who was revolutionizing Italian painting during those same years, an influence evident in the more sculptural modeling and the dynamism of the figures. It is precisely this synthesis between Sienese ornamental delicacy and Cimabue’s new vitality that makes the Altarpiece of St. Peter a fundamental transitional work, halfway between the Middle Ages and the proto-Renaissance that Duccio would later fully inaugurate.

Tavoletta di Biccherna (Don Guido, monaco di San Galgano, camarlengo)

The Tavoletta di Biccherna con Don Guido Monaco di San Galgano (first semester of 1280), now preserved in the Archivio di Stato in Siena, is the only work attributable to Guido di Graziano on the basis of unimpeachable documentary evidence, and it therefore occupies a uniquely privileged position in the reconstruction of his corpus. The panel depicts Don Guido, a Cistercian monk of the Abbey of San Galgano serving as camarlingo of the Sienese commune during the first six months of 1280, seated at a wooden counting table in the act of counting coins or managing the commune’s financial accounts.

The figure is rendered with remarkable precision and psychological attentiveness: the monk’s white Cistercian habit falls in carefully observed folds about his seated body, and his face — framed by the black capuche of the order — is individualised with a specificity of feature that suggests the painter worked from observation as well as convention. The architectural frame of the panel, with its arch and decorative mouldings, places the scene within a notional architectural setting that lifts the civic administrative act into a register of dignified formality appropriate to the panel’s institutional function.

This small work, commissioned by the financial magistracy of Siena, was intended not for devotional contemplation but for practical administrative use, yet it was executed with a care and a quality that reflect the cultural seriousness with which the commune regarded even its most utilitarian artistic commissions. It was from the specific handling of the face, the drapery, and the architectural framing in this panel that Luciano Bellosi, in his 1991 study, identified the stylistic fingerprint of Guido di Graziano and proceeded to attribute to the same hand the larger and more ambitious works that now form the core of his recognised catalogue. The panel therefore functions simultaneously as a historical document, an administrative artefact, and the cornerstone of the entire modern scholarly reconstruction of this artist’s identity.

San Francesco e storie della sua vita

This work, housed at the National Art Gallery of Siena under inventory number 313, is one of the most significant hagiographic panels of the 13th-century Sienese school. Originally from the high altar of the church of San Francesco in Colle di Val d’Elsa, its date ranges from the late 1270s to the early 1300s (circa 1278–1302), although post 1270 is traditionally cited as the terminus post quem.

The inscription at the saint’s feet—S. FRA(N)CISCUS—is the only epigraphic element identifying it.

The vertical panel, executed in tempera and gold on wood, is divided into three vertical sections by slender pilasters culminating in pointed arches, a scheme that anticipates the Sienese Gothic style. At the center stands the monumental figure of St. Francis, depicted standing full-length across the height of the panel, wearing the Franciscan habit, holding an open book in his left hand and a small black cross in his right. On either side are eight narrative scenes from his life, four on each column. The scenes are read according to a precise logic: on the left, one proceeds from bottom to top; on the right, from top to bottom—thus creating a continuous chronological sequence around the central figure.

At the top of the panel, in the mitre-shaped tip, the figure of Christ the Redeemer is still visible, depicted from the waist up, with a blessing gesture, surrounded by eight angels. This arrangement places Francis within an explicit celestial hierarchy, as a mediator between the faithful and Christ.

The eight narrative scenes:

Left column (from bottom to top):

• The sermon to the birds opens the narrative cycle, one of the most famous episodes from the Life of Francis, rendered in a lively composition in which the saint gestures toward a dense flock of birds perched on the grass and in the trees.

• The dream of Pope Innocent III, in which the pontiff sees a vision of Francis supporting the Lateran Basilica as it threatens to collapse—a scene symbolizing divine approval of the Order.

• The third scene depicts Francis before the Crucifix of San Damiano, the foundational episode of his conversion, in which Christ, speaking from the cross, commanded him to “repair the house of God.”

• The fourth and final scene in the left column is the renunciation of his father’s estate before Bishop Guido of Assisi, a scene that seals the break with his father, Pietro di Bernardone.

Right column (from top to bottom):

• The fifth scene is that of the chariot of fire (the fiery chariot), a mystical vision in which the friars see Francis carried away in ecstasy on a chariot drawn by fiery horses, an evocation of the prophet Elijah.

• This is followed by the crucial scene of the stigmata of St. Francis, received on Mount La Verna in 1224: here, Guido di Graziano draws on iconography already developed by Guido da Siena and Dietisalvi di Speme, but with nuances that betray his familiarity with Cimabue’s crucifixes, particularly that of Santa Croce in Florence, recognizable in the slender figure of the seraphic Christ and in the delicacy of the chiaroscuro on the perizonium.

• This is followed by the establishment of the Greccio Nativity scene at Christmas 1223, the first living representation of the Nativity, with the scene set among architectural arches animated by clerics and the faithful.

• The cycle concludes with the death of Saint Francis, a solemn funeral scene showing the saint’s body surrounded by friars while a soul ascends toward heaven.

Guido di Graziano’s style in this panel shows a synthesis between the Byzantine-influenced Sienese tradition and the new trends arriving from Florence via Cimabue. The treatment of the drapery of the habit, with its slow, solemn folds in the sleeves, the prominent ears, the sharp nose, and Francis’s grave expression reflect Cimabue’s formal characteristics. However, the compositional structure of the side scenes, with the small architectural elements serving as scenic backdrops and the binary narrative of Byzantine origin, remains rooted in the tradition of earlier Sienese dossali, such as those by the Master of Tressa or Guido da Siena. The work also bears witness to an iconographic transition in the image of Francis: no longer the gaunt, ascetic saint of the early Umbrian-Florentine panels, but an imposing, almost hieratic figure who gazes at the faithful with authority—a choice that reflects the maturation of Franciscan devotion in late 13th-century Tuscany