Robert Arthur Talbot Gascoyne-Cecil, 3rd Marquess of Salisbury, (3 February 1830 – 22 August 1903), styled Lord Robert Cecil before 1865 and Viscount Cranborne from June 1865 until April 1868, was a British Conservative statesman, serving as Prime Minister three times for a total of over 13 years. He was the last Prime Minister to head his full administration from the House of Lords.