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.
Sir George Grey, 2nd Baronet Sir George Grey, 2nd Baronet, PC (11 May 1799 – 9 September 1882) was a British Whig politician. He held office under four Prime Ministers, Lord Melbourne, Lord John Russell, Lord Aberdeen, and Lord Palmerston, and notably served three times as Home Secretary.