Question: Which British aristocrat and politician born in 1945 served as the Chairman of the Council of King's College London before Christopher Geidt?

Related documents: [0]  [DOC] Arthur Charles Valerian Wellesley, 9th Duke of Wellington, (born 19 August 1945) is a British aristocrat and politician. He has served as Conservative Party Member of the European Parliament (1984–1989) for Surrey West and currently sits as a hereditary peer in the House of Lords since 2015. [END] 
[1]  [DOC] Sir Christopher Edward Wollaston MacKenzie Geidt {'1': ", '2': ", '3': ", '4': "} (born 17 August 1961) was the private secretary to Queen Elizabeth II from September 2007 to 2017. As of July 2016, Geidt also serves as the Chairman of the Council of King's College London, succeeding the Duke of Wellington. [END]  
Answer: Duke of Wellington
Duke of Wellington