Éamon de Valera
The third President of Ireland, Éamon de Valera was born in New York and one of the most influential Irish politians of the 20th century. He was one of the leaders of the 1916 Rising, and fought in the Civil War on the anti-treaty side. He founded Fianna Fáil and became Taoiseach on three occasions. He was 76 when he was elected President in 1959 and served two terms in office.
The fifth President, Cearbhall O'Dálaigh (1974-6) was President of the Supreme Court and a Judge in the European Court of Justice before becoming President. He resigned in October 1976, after he was critized be a government minister for referring a Bill to the Supreme Court before he signed it into law.
The seventh President of Ireland was Mary Robinson who served for almost 7 years before becoming UN High Commissioner for Human Rights. At 46 she was the youngest person to become President and she used her time in office to change how the Office of the President was seen, taking a very active and visible role on many social issues.