Lieutenant-Colonel Charles Richard John Spencer-Churchill, 9th Duke of Marlborough,, styled Earl of Sunderland until 1883 and Marquess of Blandford between 1883 and 1892, was a British soldier and Conservative politician, and a close friend of his first cousin Winston Churchill. He was often known as "Sunny" Marlborough after his courtesy title of Earl of Sunderland.

Sir Winston Leonard Spencer Churchill was a British statesman, soldier, and writer who twice served as Prime Minister of the United Kingdom, from 1940 to 1945 during the Second World War, and again from 1951 to 1955. Apart from two years between 1922 and 1924, he was a Member of Parliament (MP) from 1900 to 1964 and represented a total of five constituencies. Ideologically an adherent to economic liberalism and imperialism, he was for most of his career a member of the Conservative Party, which he led from 1940 to 1955. He was a member of the Liberal Party from 1904 to 1924.