Thomas Ashby identified this sketch as a view of Sant Sabina on the crest of the Aventine Hill.1 Turner has drawn the church from the level of the river, at a location near the Porto di Ripa Grande. The sweeping vertical strokes in the foreground are probably masts of ships docked in the port. The inscription refers to the fragments of marble which could still be seen on the Marmorata, the quay on the left bank of the river, used in ancient times for unloading marble.
In the bottom left-hand corner is an unidentified architectural detail.
Thomas Asby, unpublished notes, Turner Bequest Archive, Tate.