Derby, 15th Earl of, eldest son of the preceding; entered Parliament as Lord Stanley in 1848; was a member of the three Derby administrations, in the first and third in connection with foreign affairs, and in the second as Secretary for India, at the time when the government of India passed from the Company to the Crown; became Earl in 1869; was Foreign Secretary under Mr. Disraeli in 1874, but retired in 1878; in 1885 joined the Liberal party, and held office under Mr. Gladstone, but declined to follow him in the matter of Home Rule, and joined the Unionist ranks; was a man of sound and cool judgment, and took a deep interest in economical questions (1826‒1893).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Derby, 14th Earl of * Derby Day