Robert Gascoyne-Cecil, 3rd Marquess of Salisbury ALS dated Sept 6 1899. Three pages 8vo Walmer Castle ,Walmer, Kent to the Dean of Lincoln marked Private. Salisbury thanks his correspondent for their letter and remarks. Robert Arthur Talbot Gascoyne-Cecil, 3rd Marquess of Salisbury KG GCVO PC FRS DL ( 3 February 1830 - 22 August 1903) was a British statesman and Conservative politician who served as Prime Minister of the United Kingdom three times for a total of over thirteen years. He was also Foreign Secretary for much of his tenure, and during his last two years of office he was Lord Keeper of the Privy Seal. He avoided alignments or alliances, maintaining the policy of splendid isolation.