Giovanni di Ser Giovanni Guidi

Giovanni di Ser Giovanni Guidi was born in 1406 in San Giovanni Valdarno, in the Florentine countryside; no source consulted gives an exact day or month of birth, only the year. He was the younger brother of the painter Masaccio (Tommaso di Ser Giovanni di Mone Cassai) and the grandson of Mone di Andreuccio, a maker of wedding chests, a trade that shaped his own specialty.

He trained in the workshop tradition rather than through any formal school. Around 1420 to 1421 he is recorded as an assistant in a Bicci-family Florentine workshop, and by 1429 he had established his own workshop in the parish of Sant'Apollinare in Florence. He joined the city's Guild of Saint Luke, the painters' guild, in 1430, and matriculated in the Art of Doctors and Apothecaries, the guild that also regulated painters' materials, in 1433. He became known as "Lo Scheggia," or "the Splinter."

He specialized in cassone panels, spalliera panels, and deschi da parto, painted trays commissioned to mark a birth. His best-known surviving work is the desco da parto he painted in 1449 for the birth of Lorenzo de' Medici, depicting the Triumph of Fame and bearing Medici and Tornabuoni arms; it descended through the Medici household and is now associated with the Metropolitan Museum of Art. His only known signed work is a fresco of the Martyrdom of Saint Sebastian, dated 1456 to 1457.

He died in Florence in 1486 and was buried in the Basilica di Santa Croce. One source, Google Arts and Culture, gives the specific death date as 1 November 1486; that date has not been independently corroborated in the other biographical references consulted, so it should be read as indicative rather than confirmed.

Scholarship on Lo Scheggia treats him as a significant, if long-underappreciated, figure in the Florentine domestic-painting tradition, valued for his cassone and desco da parto compositions, their crowded processional scenes, and their role documenting Florentine civic and social life, including recognizable views such as the Florence Baptistery in the so-called Adimari Cassone. His work is consistently discussed alongside that of his brother Masaccio, both as a point of comparison and as a distinct, more decorative and narrative practice suited to domestic commissions rather than to fresco cycles or altarpieces. No verbatim critical commentary from a named critic in a major outlet could be confirmed in the sources consulted for this profile; the available material is institutional and curatorial rather than a body of published criticism.

Giovanni di Ser Giovanni Guidi's market is small, thin, and concentrated in the Old Master category, where his cassone panels and related furnishing paintings occasionally reach the block at major international houses. A cassone panel, Triumph of Lucius Aemilius Paullus over King Perseus of Macedon, with provenance to the Jacques Goudstikker collection, has been offered at Sotheby's New York, but the exact hammer price and sale date are not confirmed in the sources reviewed for this profile, so no figure is published as his auction record. The one sale that can be confirmed with a specific price is a smaller devotional panel, Madonna and Child holding grapes, with two angels, which sold for EUR 66,560 at Dorotheum in Vienna; its exact sale date is likewise unconfirmed. The gap between an apparently major cassone panel and a modestly priced devotional panel illustrates how strongly price depends on the scale, subject, and attribution strength of the individual work rather than on a single artist-wide trend line.

There is no catalogue raisonne and no contemporary gallery, estate, or foundation representing Giovanni di Ser Giovanni Guidi; as a fifteenth-century artist, his works reach the market almost exclusively through Old Master auction departments, and attribution (full autograph work versus workshop or "circle of" status) is the single largest driver of value. Many of his best-documented paintings, including the Adimari Cassone and the Triumph of Fame desco da parto, are already in museum hands, which limits the pool of works available to private collectors and means that any single sale can be an outlier rather than a reliable market benchmark. Provenance research and connoisseurship, not certificates from a studio archive, are the operative tools for verifying a work in this market. Public price data is also thin: only one sale, at Dorotheum, carries a confirmed price, and collectors should treat any other reported figure for this artist with caution until it can be verified against a primary auction-house source.