Leonard James Callaghan, Baron Callaghan of Cardiff, KG, PC (27 March 1912 – 26 March 2005) was a British Labour politician who was the Prime Minister of the United Kingdom from 1976 to 1979 and Leader of the Labour Party from 1976 to 1980. Callaghan is to date the only politician in history to have served in all four of the "Great Offices of State", having been Chancellor of the Exchequer from 1964 to 1967, Home Secretary from 1967 to 1970, and Foreign Secretary from 1974 until his appointment as Prime Minister in 1976.