Painter of Cornwall, her maiden name was Mary Tregurtha (her husband Albert Jewels was killed in World War I). She was born in Newlyn, her sister Cordelia being the first wife of the sculptor Frank Dobson, who made a fine bronze head of Mary. She was encouraged by the painter Cedric Morris, when he was staying in Newlyn in 1919; he gave her a canvas, four tubes of paint and told her to cover the canvas by the evening. She was later encouraged by Christopher Wood and Augustus John, although she claimed she was “influenced by nobody and entirely self-taught, a true Celt loving my Cornwall”. Was a member of the St Ives Society and a founder-member of Penwith Society, 1949. Had solo show at Dorothy Warren’s Gallery, 1927; another at Newlyn Art Gallery in 1977.