James Gascoyne-Cecil, 2nd Marquess of Salisbury James Gascoyne-Cecil, 2nd Marquess of Salisbury James Brownlow William Gascoyne-Cecil, 2nd Marquess of Salisbury, (17 April 1791 – 12 April 1868), styled Viscount Cranborne until 1823, was a British Conservative politician. He held office under the Earl of Derby as Lord Privy Seal in 1852 and Lord President of the Council between 1858 and 1859. He was the father of Robert Gascoyne-Cecil, 3rd Marquess of Salisbury, three times Prime Minister of the United Kingdom, and grandfather of Arthur Balfour, who also served as Prime Minister. Salisbury was the son of James Cecil, 1st Marquess of Salisbury, and Lady Emily Mary
Prime Minister of Australia prime minister, otherwise William McMahon63. Robert Menzies was the oldest person to ever be prime minister, leaving office at 71 years old. The longest-serving Prime Minister was Sir Robert Menzies, who served in office twice: from 26 April 1939 to 28 August 1941, and again from 19 December 1949 to 26 January 1966. In total Robert Menzies spent 18 years, 5 months and 12 days in office. He served under the United Australia Party and the Liberal Party respectively. The shortest-serving Prime Minister was Frank Forde, who was appointed to the position on 6 July 1945 after the death of