Marlborough: His Life and Times by Winston S. Churchill. Churchill researched and wrote this book at Blenheim Palace. It was a biography of his famous ancestor, the 1st Duke of Marlborough and was published in four volumes between 1933 and 1938.

The World Crisis by Winston Churchill, published between 1923 and 1931 in six volumes. It is Churchill’s 3,261-page history of the First World War.