Here Turner depicts the medieval Marxburg Castle, built atop the precipitous cliffs of the Rhine Gorge overlooking the town of Braubach. For other sketches of the Marxburg in this book see Tate D28516, D28521–D28523; Turner Bequest CCXC 82b, 83a–84a. For earlier representations see the Waterloo and Rhine and Rhine sketchbooks of 1817 (Tate D12801, D12851, D12913, D12974; CLX 52, 77, CLXI 19, 49). See also two highly finished watercolours of the Marxburg produced in 1817 (Indianapolis Museum of Art) and 1820 (British Museum, London).1
Andrew Wilton, J.M.W. Turner: His Life and Work, Fribourg 1979, p.376 no.653 and p.p.380 no.692 respectively.