Geoffrey G. Butler is the uncle and mentor of a man who was a prominent what?
Geoffrey G. Butler Sir George Geoffrey Gilbert Butler (15 August 1887 - 2 May 1929) was an English historian, academic and politician who served as a Member of Parliament for Cambridge University, 1923–1929. He was uncle of and mentor to Rab Butler, and was an early sponsor of Liddell Hart, a former student who would upon the senior Butler's death that 'I have never had a better friend, in every sense of the word’. An avid Conservative, he was a significant figure in the intellectual and political history of his party between the World Wars. In April–May 1917 he was a member of the Balfour Mission, intended to promote cooperation between the US and UK during World War I.
Geoffrey de Mandeville, 1st Earl of Essex Geoffrey de Mandeville II, 1st Earl of Essex (died September 1144) was a prominent figure during the reign of King Stephen of England. His biographer, the 19th-century historian J. H. Round, called him "the most perfect and typical presentment of the feudal and anarchic spirit that stamps the reign of Stephen." That characterisation has been disputed since the later 20th century.