Archibald Primrose, 5th Earl of Rosebery

Rosebery first came to national attention in 1879 by sponsoring the successful Midlothian campaign of William Ewart Gladstone. His most successful performance in office came as chairman of the London County Council in 1889. He entered the Cabinet in 1885 and was twice Foreign Secretary, paying special attention to French and German affairs. He succeeded Gladstone as prime minister and leader of the Liberal Party in 1894; the Liberals lost the 1895 election. He resigned the party leadership in 1896 and never again held political office.
Rosebery was widely known as a brilliant orator, an outstanding sportsman and marksman, a writer and historian, connoisseur and collector. All of these activities attracted him more than politics, which grew boring and unattractive. Furthermore, he drifted to the right of the Liberal party and became a bitter critic of its policies. Winston Churchill, observing that he never adapted to democratic electoral competition, quipped: "He would not stoop; he did not conquer."
Rosebery was a Liberal Imperialist who favoured strong national defence and imperialism abroad and social reform at home, while being solidly anti-socialist. Historians judge him a failure as foreign minister and as prime minister. Provided by Wikipedia