John Postle Heseltine (1843–1929) was a wealthy stockbroker who worked as an amateur painter and etcher, and exhibited his work throughout his life. The posthumous sale of his extensive collection of prints and drawings included a volume of nineteen pencil sketches by or attributed to Girtin, many of which he acquired from the collection of Dr John Percy (1817–89) (Exhibitions: Sotheby’s, 29 May 1935). Heseltine was also a benefactor of the National Gallery and the British Museum.