Saint John the Evangelist (recto; Cartoon for a Fresco) ; Saint Mark (verso; Cartoon for a Fresco). , 1548?49, (Recto and verso) Charcoal, highlighted with white chalk, on blue paper; outlines heavily stylus-incised on recto, and partly so on verso, Overall: 20 7/16 x 9 5/8 in. (51. 9 x 24. 4 cm), Drawings, Francesco Salviati (Francesco de' Rossi) (Italian, Florence 1510?1563 Rome), This rare, bold, and large drawing was a preparatory cartoon (full-scale drawing), for a fresco painting of 1548-49 in the cappella del Pallio, a small private chapel of the Cardinal Alessandro Farnese (1520-1589) in the Palazzo della Cancelleria in Rome