Final answer:
Earl Derby is the title and name of a prominent British politician in the late 18th and early 19th centuries. The 12th Earl of Derby, Edward Smith Stanley, was a politician and served as Prime Minister.
Step-by-step explanation:
Earl Derby refers to the title and name of a prominent British politician in the late 18th century and early 19th century. The 12th Earl of Derby was Edward Smith Stanley, who was a politician and served as Prime Minister of the United Kingdom on three separate occasions. He is known for his contribution to British politics during a crucial time in history.