Question: What years did ponsonby baronet serve a conservative politician before they became a prime minister

Related documents: [0]  [DOC] Robert Anthony Eden, 1st Earl of Avon, (12 June 1897 – 14 January 1977) was a British Conservative politician who served three periods as Foreign Secretary and then a relatively brief term as Prime Minister of the United Kingdom from 1955 to 1957. [END] 
[1]  [DOC] The Ponsonby Baronetcy, of Wootton in the County of Oxford, is a title in the Baronetage of the United Kingdom. It was created on 27 January 1956 for the Conservative politician Charles Ponsonby. He had earlier represented Sevenoaks in the House of Commons and served as Parliamentary Private Secretary to the Foreign Secretary Anthony Eden from 1941 to 1945. A member of the prominent Ponsonby family headed by the Earl of Bessborough, he was the son of the Hon. Edwin Charles William Ponsonby, fourth son of Charles Ponsonby, 2nd Baron de Mauley. As of 2010 the title is held by the second Baronet's son, the third Baronet, who succeeded in 2010. His father was Lord Lieutenant of Oxfordshire between 1980 and 1996. As a descendant of the second Baron de Mauley, he is also in remainder to this title as well as to the earldom of Bessborough. [END]  
Answer: Prime Minister of the United Kingdom from 1955 to 1957
Prime Minister of the United Kingdom from 1955 to 1957