The Fenian epic begins, before the birth of its hero, with the struggle of two rival clans, each of whom claimed to be the real and only Fianna Eirinn. They were called the Clann Morna, of which Goll mac Morna was head, and the Clann Baoisgne[241], commanded by Finn’s father, Cumhal. A battle was fought at Cnucha[242], in which Goll killed Cumhal, and the Clann Baoisgne was scattered. Cumhal’s wife, however, bore a posthumous son, who was brought up among the Slieve Bloom Mountains secretly, for fear his father’s enemies should find and kill him. The boy, who was at first called Deimne[243], grew up to be an expert hurler, swimmer, runner, and hunter. Later, like Cuchulainn, and indeed many modern savages, he took a second, more personal name. Those who saw him asked who was the “fair” youth. He accepted the omen, and called himself Deimne Finn. At length, he wandered to the banks of the Boyne, where he found a soothsayer called Finn the Seer living beside a deep pool near Slane, named “Fec’s Pool”, in hope of catching one of the “salmons of knowledge”, and, by eating it, obtaining universal wisdom. He had been there seven years without result, though success had been prophesied to one named “Finn”. When the wandering son of Cumhal appeared, Finn the Seer engaged him as his servant. Shortly afterwards, he caught the coveted fish, and handed it over to our Finn to cook, warning him to eat no portion of it. “Have you eaten any of it?” he asked the boy, as he brought it up ready boiled. “No indeed,” replied Finn; “but, while I was cooking it, a blister rose upon the skin, and, laying my thumb down upon the blister, I scalded it, and so I put it into my mouth to ease the pain.” The man was perplexed. “You told me your name was Deimne,” he said; “but have you any other name?” “Yes, I am also called Finn.” “It is enough,” replied his disappointed master. “Eat the salmon yourself, for you must be the one of whom the prophecy told.” Finn ate the “salmon of knowledge”, and thereafter he had only to put his thumb under his tooth, as he had done when he scalded it, to receive fore-knowledge and magic counsel.[244] Thus armed, Finn was more than a match for the Clann Morna. Curious legends tell how he discovered himself to his father’s old followers, confounded his enemies with his magic, and turned them into faithful servants.[245] Even Goll of the Blows had to submit to his sway. Gradually he welded the two opposing clans into one Fianna, over which he ruled, taking tribute from the kings of Ireland, warring against the Fomorian “Lochlannach”, destroying every kind of giant, serpent, or monster that infested the land, and at last carrying his mythical conquests over all Europe.