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
Prime Minister of Australia Ben Chifley lived the least of all former prime ministers, as he died one year and six months after his term as prime minister. All other deceased former prime ministers have lived at least another 10 years, with the longest surviving former prime minister being Gough Whitlam, who lived 38 years and 11 months after office, surpassing Stanley Bruce's previous record of 37 years and 10 months. The youngest person to become prime minister was Chris Watson37, who was also 37 when he ceased being prime minister. The oldest person to become prime minister was John McEwen67 as an interim