Robert Arthur Talbot Gascoyne-Cecil , 3rd Marquess of Salisbury , KG GCVO PC ( 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 and thrice Prime Minister , serving for a total of over 13 years .
Robert Arthur Talbot Gascoyne-Cecil , 3rd Marquess of Salisbury ( 3 February 1830 - 22 August 1903 ) was a Prime Minister of the United Kingdom .