The late dates of the manuscripts may reflect a longer oral tradition for the Fenian stories, the same oral tradition which was interpreted from Gaelic to English by James Macpherson in the Ossian stories.
As datas tardías dos manuscritos poderían reflectir unha longa tradición oral nas historias dos Fenian, a mesma tradición que foi interpretada do gaélico ó inglés por James MacPherson nas historias de Ossian.