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This drawing, which the princess describes in a letter to the painter as being ni carbone and not in colours, is now one of the treasures of the Louvre, and has an inestimable value, both as the work of Leonardo and as a genuine portrait of the most brilliant lady of the Renaissance. Gazette des B. Arts, 1879, p. 514. Renier, Sonetti di Pistoia p. 35. A. Baschet, Aldo Manuzio, pp. 70-75.