For ten points, name this legendary Irish warrior, the son of Cumhall and father of Oisin, the leader of the Fianna.
As young man, this man promised the mother of Glonda that he would avenge the death of her son. In doing so, he killed Liath Luachra and obtained the crane bag. In another story about this man, he and eight other men defeated the dog-headed and cat-headed armies of the King of Ruadledth. By sticking a spear into his head to stay awake, this grandfather of Oscar was able to defeat the evil fairy Aileen of Tara. Fear Donrich turned one of this man's consorts, Sadhbh, into a deer and this man's two hounds were called Bran and Sceolan. With the help of Aengus, Diarmuid eloped with a woman, who was supposed to marry this figure, Grainne. This man gained the gift of prophecy when the he sucked the thumb that he had burned while cooking the Salmon of Knowledge for Finnegas. For ten points, name this legendary Irish warrior, the son of Cumhall and father of Oisin, the leader of the Fianna.
As young man, this man promised the mother of Glonda that he would avenge the death of her son.
{Finn MacCool} or {Deinme} or {Fionn mac Cumhaill}