The first Viscount Rothermere was the younger brother of Alfred Harmsworth, 1st Viscount Northcliffe and the elder brother of Cecil Harmsworth, 1st Baron Harmsworth, Sir Leicester Harmsworth, 1st Baronet, and Sir Hildebrand Harmsworth, 1st Baronet.
Baron | Cecil B. DeMille | Louis Mountbatten, 1st Earl Mountbatten of Burma | Horatio Nelson, 1st Viscount Nelson | Herbert Kitchener, 1st Earl Kitchener | Charles Cornwallis, 1st Marquess Cornwallis | 1st United States Congress | Frederick Roberts, 1st Earl Roberts | Bernard Montgomery, 1st Viscount Montgomery of Alamein | William Cecil, 1st Baron Burghley | Robert Harley, 1st Earl of Oxford and Earl Mortimer | George Villiers, 1st Duke of Buckingham | Thomas Wentworth, 1st Earl of Strafford | Robert Gascoyne-Cecil, 3rd Marquess of Salisbury | Cecil Rhodes | baron | William Pitt, 1st Earl of Chatham | Sacha Baron Cohen | Joseph Lister, 1st Baron Lister | Joey Baron | Cecil Taylor | Robert Baden-Powell, 1st Baron Baden-Powell | John Scott, 1st Earl of Eldon | Henry Brougham, 1st Baron Brougham and Vaux | Edward Seymour, 1st Duke of Somerset | Robert, 1st Earl of Gloucester | Guy Carleton, 1st Baron Dorchester | Garnet Wolseley, 1st Viscount Wolseley | Douglas Haig, 1st Earl Haig | George Monck, 1st Duke of Albemarle |
It was created in 1939 for the Liberal politician Cecil Harmsworth, Under-Secretary of State for Foreign Affairs between 1919 and 1922.