William Pitt was a British statesman who served as the last prime minister of Great Britain from 1783 until the Acts of Union 1800, and the first official prime minister of the United Kingdom from January 1801. He left office in March 1801, but served as prime minister again from 1804 until his death in 1806. He was also Chancellor of the Exchequer for all his time as prime minister. He is known as "Pitt the Younger" to distinguish him from his father, William Pitt the Elder, who had also previously served as prime minister from 1766–1768. Born: May 28, 1759 Died: January 23, 1806 In office: May 10, 1804 – January 23, 1806 Wiki link