Lord Liverpool redirects here. For other uses see Earl of Liverpool.Robert Banks Jenkinson 2nd Earl of Liverpool KG PC (7 June 1770 – 4 December 1828) was a British politician and Prime Minister of the United Kingdom (1812–27) since the Union with Ireland in 1801. He was 42 years old when he became premier in 1812 which made him younger than all of his successors.