Luini. He was a pupil of Leonardo. Its subject differs from Leonardo's in that it includes St. Joseph. Luini's painting now is in the Biblioteca Ambrosiana, in Milan. The figure of Pomona in Francesco Melzi's painting, Vertumnus and Pomona, that is held in the Gemäldegalerie in Berlin, is based on that of the Virgin in this cartoon by Leonardo. The similarity may be seen most distinctively in the head. Melzi was another one of da Vinci’s pupils, one who played a significant role in his life. He would become the literary executor of all of da Vinci's papers and whose curation of them, led to the preservation of many of them into book form. He also drew a portrait of da Vinci that is among the few confirmed images of him. History The date and place of execution of the cartoon is disputed. The earliest reference to it is by the biographer Giorgio Vasari who, writing in the mid sixteenth century, says that the work was created while Leonardo was in Florence, as a guest of the Servite Monastery. Vasari says that for two days people young and old flocked to see the drawing as if they were attending a festival. This would date the cartoon to about 1500. A date of 1498–99 is put on the work by Padre Sebastiano Resta, who wrote to Giovanni Pietro Bellori saying that Leonardo had drawn the cartoon in Milan at the request of Louis XII of France. While this date has gained wide acceptance, the association with Louis XII has not. More recent historians have dated the work as early as the mid 1490s and, in the case of Carlo Pedretti and Kenneth Clark, as late as 1508–1510. Martin Kemp notes that the hydraulic engineering images appearing among the sketches in the preparatory drawing in the British Museum dates the composition to around 1507–1508, when Leonardo was making similar studies in the Codex Atlanticus. In the seventeenth century, the drawing belonged to the Counts Arconati of Milan. In 1721, it passed to the Casnedis, then to the Sagredo in Venice. In 1763, it was acquired by Robert Udny. By 1791, it was inventoried as belonging to the Royal Academy, in London. Sometimes the cartoon still is known as "The Burlington House Cartoon", a title once used frequently in reference to the building the Royal Academy that housed the drawing. In 1962, the