Perhaps in the first musician, Cascorach, though he is described as the son of a Tuatha De Danann minstrel, we behold a mortal like one of the many Irish pipers and musicians who used to go, or even go yet, to the fairy-folk to be educated in the musical profession, and then come back as the most marvellous players that ever were in Ireland; though if Cascorach were once a mortal it seems that he has been quite transformed in bodily nature so as to be really one of the Tuatha De Danann himself. But Aillén mac Midhna is undoubtedly one of the mighty 'gentry' who could--as we heard from County Sligo--destroy half the human race if they wished. Aillén visits Tara, the old psychic centre both for Ireland's high-kings and its Druids. He comes as it were against the conquerors of his race, who in their neglectfulness no longer render due worship and sacrifice on the Feast of _Samain_ to the Tuatha De Danann, the gods of the dead, at that time supreme; and then it is that he works his magic against the royal palaces of the kings and Druids on the ancient Hill. And to overcome the magic of Aillén and slay him, that is, make it impossible for him to repeat his annual visits to Tara, it required the might of the great hero Finn, who himself was related to the same _Sidhe_ race, for by a woman of the Tuatha De Danann he had his famous son Ossian (Oisin).[244] In _Gilla dé_, who is Manannan mac Lir, the greatest magician of the Tuatha De Danann, disguised as a being who can disappear in the twinkling of an eye whenever he wishes, and reappear unexpectedly as a 'kern that wore garb of yellow stripes', we meet with another fairy musician. And to him O'Donnell says:--'By Heaven's grace again, since first I heard the fame of them that within the hills and under the earth beneath us make the fairy music, ... music sweeter than thy strains I have never heard; thou art in sooth a most melodious rogue!'[245] And again it is said of him:--'Then the _gilla decair_ taking a harp played music so sweet ... and the king after a momentary glance at his own musicians never knew which way he went from him.'[246] SOCIAL ORGANIZATION AND WARFARE AMONG THE _SIDHE_ So far, we have seen only the happy side of the life of the _Sidhe_-folk--their palaces and pleasures and music; but there was a more human (or anthropomorphic) side to their nature in which they wage war on one another, and have their matrimonial troubles even as we moderns. And we turn now to examine this other side of their life, to behold the _Sidhe_ as a warlike race; and as we do so let us remember that the 'gentry' in the Ben Bulbin country and in all Ireland, and the people of Finvara in Knock Ma, and also the invisible races of California, are likewise described as given to war and mighty feats of arms.