Study of a Woman’s Dress for a Portraitca. 1540–60Study of a Bearded Man Wearing the Helmet of Guidobaldo II della Rovere, Duke of Urbino1536–40Two Seated Figures in a Landscape with Mountains and a Town (recto); Sketch of a Landscape with Mountains and Buildings (verso)ca. 1510–15Sultan Suleyman the Magnificent Wearing the Jewel-Studded Helmetca. 1540–50Six Studies of a King for an Adoration16th century