When did the man who Lord Frederick Charles Cavendish was a protege of last serve as Prime Minister?
William Ewart Gladstone William Ewart Gladstone, ( ; 29 December 1809 – 19 May 1898) was a British Liberal statesman and earlier Conservative politician. In a career lasting over 60 years, he served as Prime Minister four separate times (1868–74, 1880–85, February–July 1886 and 1892–94), more than any other person, and served as Chancellor of the Exchequer four times. Gladstone was also Britain's oldest Prime Minister; he resigned for the final time when he was 84 years old.
Archibald Sinclair, 1st Viscount Thurso Archibald Henry Macdonald Sinclair, 1st Viscount Thurso, {'1': ", '2': ", '3': ", '4': "} (22 October 1890 – 15 June 1970), known as Sir Archibald Sinclair, Bt, between 1912 and 1952, and often as Archie Sinclair, was a British politician and leader of the Liberal Party.