Robert Gascoyne-Cecil, 3rd Marquess of Salisbury prime minister of his lifetime. Attlee immediately replied: "Salisbury". The 6th Marquess of Salisbury commissioned Andrew Roberts to write Salisbury's authorised biography, which was published in 1999. After the Bering Sea Arbitration, Canadian Prime Minister Sir John Sparrow David Thompson said of Lord Salisbury's acceptance of the Arbitration Treaty that it was "one of the worst acts of what I regard as a very stupid and worthless life". The British phrase 'Bob's your uncle' is thought to have derived from Robert Cecil's appointment of his nephew, Arthur Balfour, as Chief Secretary for Ireland. Fort Salisbury (now Harare) was named in
Records of Prime Ministers of the United Kingdom when he succeeded his father as the 3rd Duke of Grafton on 6 May 1757, eleven years before his term of office began. The longest service as MP was enjoyed by Sir Winston Churchill, who sat for a total of 63 years and 360 days, for five successive seats, between 1 October 1900 and retiring on 25 September 1964, excluding two intervals out of parliament (in 1908 and 1922–24), retiring as Father of the House. He was in the Commons throughout both his terms as Prime Minister, and his service covered the terms of eleven other Prime Ministers, from Lord