William Duncombe, Viscount Helmsley British politician (1852–1881) (1852–1881) Parents William Duncombe, 1st Earl of Feversham Mabel Graham Children Charles Duncombe, 2nd Earl of Feversham Mabel Duncombe Siblings Helen Vincent, Viscountess D'Abernon James Duncombe Hubert Duncombe Lady Mabel Duncombe Lady Ulrica Duncombe Lady Hermione Duncombe Partners Muriel Duncombe, Viscountess Helmsley