August 29th , 1975
Eamon de Valera (born Edward George de Valera, sometimes Gaelicised Eamonn de Bhaileara; October 14, 1882 ? August 29, 1975), was an Irish politician, best known as a leader of Irelands struggle for independence from Britain in the early 20th Century, and the Republican anti-Treaty opposition in the ensuing Irish Civil War.
At various times a mathematician, teacher and a politician, he served as Irish head of government on three occasions, as second President of the Executive Council (original name for the prime minister) and the first Taoiseach (prime ministerial title after 1937). He ended his political career as President of Ireland, serving two terms from 1959 until 1973. Eamon de Valera was also the Chancellor of the National University of Ireland from 1922 until 1975.
Revered and despised in equal measure throughout Ireland, during his lifetime and posthumously, Eamon de Valera is generally regarded as the most influential person in the history of 20th Century Ireland.