What is Seán Lemass?
{{Infobox officeholder | name = Seán Lemass | image = Seán Lemass, 1966.jpg | caption = Lemass in 1966 | order = 4th | office = Taoiseach | president = [[Éamon de Valera]] | 1blankname = [[Tánaiste]] | 1namedata = [[Seán MacEntee]]<br>[[Frank Aiken]] | term_start = 23 June 1959 | term_end = 10 November 1966 | predecessor = Éamon de Valera | successor = [[Jack Lynch]] | office1 = [[Leader of Fianna Fáil]] | term_start1 = 23 June 1959 | term_end1 = 10 November 1966 | predecessor1 = Éamon de Valera | successor1 = Jack Lynch | office2 = [[Tánaiste]] | taoiseach2 = Éamon de Valera | term_start2 = 20 March 1957 | term_end2 = 23 June 1959 | predecessor2 = [[William Norton]] | successor2 = [[Seán MacEntee]] | taoiseach3 = Éamon de Valera | term_start3 = 13 June 1951 | term_end3 = 2 June 1954 | predecessor3 = William Norton | successor3 = William Norton | taoiseach4 = Éamon de Valera | term_start4 = 14 June 1945 | term_end4 = 18 February 1948 | predecessor4 = [[Seán T. O'Kelly]] | successor4 = William Norton | office5 = [[Minister for Business, Enterprise and Innovation|Minister for Industry and Commerce]] | taoiseach5 = Éamon de Valera | term_start5 = 20 March 1957 | term_end5 = 23 June 1959 | predecessor5 = William Norton | successor5 = Jack Lynch | taoiseach6 = Éamon de Valera | term_start6 = 13 June 1951 | term_end6 = 2 June 1954 | predecessor6 = [[Thomas F. O'Higgins]] | successor6 = William Norton | taoiseach7 = Éamon de Valera | term_start7 = 18 August 1941 | term_end7 = 18 February 1948 | predecessor7 = Seán MacEntee | successor7 = [[Daniel Morrissey]] | taoiseach8 = Éamon de Valera | term_start8 = 9 March 1932 | term_end8 = 16 September 1939 | predecessor8 = [[Patrick McGilligan]] | successor8 = Seán MacEntee | office9 = [[Minister for Supplies]] | taoiseach9 = Éamon de