 Louis-Napoléon Bonaparte (later Napoleon III) often visited Londonderry House while exiled in London in 1836-40 and 1846–48.During World War I, the house was used as a military hospital.After the war, Charles Vane-Tempest-Stewart, Viscount Castlereagh, and his wife, Edith Helen Chaplin, continued to use the house and entertained extensively.