Diana, Lady Mosley (17 June 1910 ? 11 August 2003), born Diana Freeman-Mitford and usually known as Diana Mitford, was one of Britain's noted Mitford sisters. She was first married to Bryan Walter Guinness, heir to the barony of Moyne, with whom she had two sons, Desmond (left) and Jonathan (right) and upon her divorce from him married Sir Oswald Mosley, 6th Baronet of Ancoats, leader of the British Union of Fascists.