As Cecilia Powell first identified, the subject of this sketch is the Castel Nuovo, a large fortress also known as the Maschio Angioino, which stands beside the quayside near the main port in Naples.1 Originally dating from the thirteenth century, the castle with its five cylindrical towers has been extended and rebuilt a number of times. This study depicts the northern side from present-day Piazza Municipio, with the Torre di Beverello on the left and the Torre di San Giorgio and Torre di Mezzo on the right. The campanile rising above the walls of the fortress in the centre is no longer extant. Visible in the distance on the far left-hand side is the lighthouse on the Mole in the old port.
Powell 1984, p.424.