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|Portrait of Luca Pacioli|
|Artist||Attributed to Jacopo de' Barbari|
|Medium||Tempera on panel|
|Dimensions||99 cm × 120 cm (39 in × 47 in)|
|Location||Capodimonte Museum, Naples|
It was later moved to Florence through Vittoria della Rovere-Medici, belonging to both the reigning dynasties of Urbino and Tuscany. The painting reappeared in the 19th century, as a property of the Ottaviano branch of the Medicis. It was subsequently acquired by the Italian state to prevent its being sold to England.
The painting has been generically attributed to Jacopo de' Barbari due to the presence of a cartouche with the inscription IACO.BAR. VIGENNIS. P. 1495, with the enigmatic presence of a fly above it. However, the attribution to the Venetian painter is now generally regarded as wrong, due to pictorial and historical considerations.
The painting portrays the friar and mathematician with a table filled with geometrical tools: slate, chalk, compass, a dodecahedron model. A rhombicuboctahedron, half-filled with water and characterized by a detailed triple reflection effect of the Ducal Palace of Urbino, is suspended from the ceiling. Pacioli is demonstrating a theorem by Euclid written in an open book. The closed book, with the inscription LI.RI.LUC.BUR. ("Liber reverendi Luca Burgensis") is supposed to be his Summa de arithmetica, geometria. Proportioni et proportionalita (1494).
The character on the right has not been identified conclusively: he could be Guidobaldo da Montefeltro, the then duke of Urbino who was a fervent scholar of mathematics and to whom the Summa was dedicated, the German painter Albrecht Dürer, or with one Francesco di Bartolomeo Archinto, of whom a very similar portrait, of Leonardesque school, exists in the National Gallery, London.
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