Robert Anthony Eden , 1st Earl of Avon , KG , MC , PC ( 12 June 1897 - 14 January 1977 ) was an English Conservative politician who was Prime Minister of the United Kingdom from 1955 to 1957 .
Anthony Eden ( Robert Anthony Eden , 1st Earl of Avon 12 June 1897 - 14 January 1977 ) was Prime Minister of the United Kingdom .