"William Pitt (1759–1806)", 1812, by George Henry Harlow (British, 1787-1819). Pitt was a British politician who became the youngest Prime Minister in 1783 at the age of 24. He left office in 1801, but was Prime Minister again from 1804 until his death in 1806. He was also the Chancellor of the Exchequer throughout his premiership. He is known as "the Younger" to distinguish him from his father, William Pitt the Elder, who previously served as Prime Minister of Great Britain.
Portrait of William Pitt (1708-1778), 1st Earl of Chatham
"Portrait of William Pitt, 1st Earl of Chatham" by Jean André Rouquet at the Victoria and Albert Museum, London - More commonly known as William Pitt the Elder (to distinguish him from his son William Pitt the Younger), this was the British Secretary of State during the Seven Years War and many victories have been attributed to his policies. This is why, for instance, when the British took Fort Duquesne from the French, they renamed it Fort Pitt - now the city of Pittsburgh, Pennsylvania.