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This rough pencil drawing forms part of a panoramic view of Naples seen from the slopes of the hill just beneath the Certosa (Charterhouse) of San Martino and Castel Sant’Elmo. The composition continues on the opposite sheet of the double-page spread, see folio 56 (D15664; Turner Bequest CLXXXIV 54), but this side depicts the vista looking south and west towards the Capo di Posillipo (Cape of Posillipo) and the island of Capri. As Lindsay Stainton has identified, the view is very similar to that of a watercolour study in the Naples: Rome C. Studies sketchbook (Tate D16101; Turner Bequest CLXXXVII 13).1 There is also a further related prospect (Tate D16100; Turner Bequest CLXXXVII 12).
Briganti, Spinosa and Stainton 1990, p.134.