All this may represent some genuine tradition with respect to a warrior band, with many exaggerations in details and numbers. Some of its outstanding heroes may have had names derived from or corresponding to those of the heroes of an existing saga. But as time went on they became as unhistorical as their ideal prototypes; round their names crystallised floating myths and tales; things which had been told of the saga heroes were told of them; their names were given to the personages of existing folk-tales. This might explain the great divergence between the "historical" and the romantic aspects of the saga as it now exists. Yet we cannot fail to see that what is claimed as historical is full of exaggeration, and, in spite of the pleading of Dr. Hyde and other patriots, little historic fact can be found in it. Even if this exists, it is the least important part of the saga. What is important is that part--nine-tenths of the whole--which "is not true because it cannot be true." It belongs to the region of the supernatural and the unreal. But personages, nine-tenths of whose actions belong to this region, must bear the same character themselves, and for that reason are all the more interesting, especially when we remember that the Celts firmly believed in them and in their exploits. A Fionn myth arose as all myths do, increasing as time went on, and the historical nucleus, if it ever existed, was swamped and lost. Throughout the saga the Fians are more than mere mortals, even in those very parts which are claimed as historical. They are giants; their story "bristles with the supernatural"; they are the ideal figures of Celtic legend throwing their gigantic shadows upon the dim and misty background of the past. We must therefore be content to assume that whether personages called Fionn, Oisin, Diarmaid, or Conan, ever existed, what we know of them now is purely mythical.