John Postle Heseltine was a painter and art collector who became a trustee of the National Gallery, London. He donated the paintings A Garden Scene with Waterfowl by Anthonie van Borssum, Portrait of a Grand Vizir by Jean-Etienne Liotard, A Cowherd passing a Horse and Cart in a Stream by Jan Siberechts, and Portrait of a Man, probably Johann Feige by Lucas Cranach the Elder. His brother was Rev. Ernest Heseltine. His daughter Clarissa Mary Heseltine married at St Paul’s Church, Knightsbridge on 8 October 1902 Charles W. Sofer Whitburn, son of Charles Joseph Sofer Whitburn. She was well known as a racehorse breeder, and at one point live at Amport House, near Andover, Hampshire.