Eamonn DeValera was elected as the third President of Ireland on the 25th of June 1959.
The position became available after Séan T. O'Kelly completed his second 7 year term in office.
He had previously served as Taoiseach and head of Fianna Fáil but retired from that role and ran for the Presidency instead.
In 1966 he was re-elected for a second term. He was 83 years old at the time, making him the oldest person to be elected head of state until 2013.
He retired in 1973 at the age of 90.