Douglas Hyde
Douglas Hyde , known as An Craoibhn Aoibhinn , was an Irish academic, linguist, and scholar of the Irish language who served as the first President of Ireland from 193845. He was a leading figure in the Gaelic revival, and first president of the Gaelic League, one of the most influential cultural organisations in Ireland at the time.
Hyde was born at Longford House in Castlerea, County Roscommon, while his mother, Elizabeth ne Oldfield was on a short visit there. His father, Arthur Hyde, whose family were originally from Castlehyde, Fermoy, County Cork, was Church of Ireland rector of Kilmactranny, County Sligo from 1852 to 1867, and it was here that Hyde spent his early years. Arthur Hyde and Elizabeth Oldfield married in County Roscommon in 1852 and had three other children, Arthur , John Oldfield , and Hugh Hyde.
Source: Wikipedia