Henry Campbell-Bannerman

Sir Henry Campbell-Bannerman, (7 September 183622 April 1908) was a British Liberal Party politician who served as Prime Minister of the United Kingdom from 1905 to 1908 and Leader of the Liberal Party from 1899 to 1908. He also served as Secretary of State for War twice, in the Cabinets of Gladstone and Rosebery. He was the first First Lord of the Treasury to be officially called "Prime Minister", the term only coming into official usage five days after he took office. He also remains the only person to date to hold the positions of both Prime Minister and Father of the House at the same time.