Ã amon de Valera ( born with the name Edward George de Valera , ) ( 14 October 1882 â `` ) was one of the dominant political figures in 20th century Ireland . Ã amon de Valera ( ; born George De Valero ; 14 October 1882 -- 29 August 1975 ) was one of the dominant political figures in 20th century Ireland .