Irish folklore leprechaun, banshees, changelings and many others. The origin of these Irish fairies could be dated back to the ancient Celtic beliefs of pagan Gods and supernatural beings. However, there is no linear path that traces the development of fairy lore in Ireland from its origin. Irish fairy lore has influenced many English authors, such as Jonathan Swift, who wrote Gulliver's Travels while living in Ireland. Ó Súilleabháin was part of the Irish Folklore Commission, "Béaloideas". Not long after the foundation of the commission he created two books for the collectors. The first, in 1937, a shorter volume in the Irish
Irish folklore Language, "Láimh-Leabhar Béaloideasa", mainly used by collectors in the Irish speaking areas. In 1942 he wrote his more well-known volume "A Handbook of Irish Folklore" (published 1947). To this day his work serves as a great resource to collectors of Irish folklore and provides a wide outline of the traditions of Irish Folklore. He also wrote a booklet of topics, in both Irish and English, in 1937 to be used by teachers and school children in primary schools in the South of Ireland as part of the Schools' Scheme for the collection of folklore (1937-1938). He focused on the native