The Mabinogeon by Thomas Bulfinch

Gwyddno Garanhir was sovereign of Gwaelod, a territory bordering on the sea. And he possessed a weir upon the strand between Dyvi and Aberystwyth, near to his own castle, and the value of an hundred pounds was taken in that weir every May eve. And Gwyddno had an only son named Elphin, the most hapless of youths, and the most needy. And it grieved his father sore, for he thought that he was born in an evil hour. By the advice of his council, his father had granted him the drawing of the weir that year, to see if good luck would ever befall him, and to give him something wherewith to begin the world. And this was on the twenty-ninth of April.

The next day, when Elphin went to look, there was nothing in the weir but a leathern bag upon a pole of the weir. Then said the weir-ward unto Elphin, "All thy ill-luck aforetime was nothing to this; and now thou hast destroyed the virtues of the weir, which always yielded the value of an hundred pounds every May eve; and tonight there is nothing but this leathern skin within it. " "How now," said Elphin, "there may be therein the value of a hundred pounds. " Well! they took up the leathern bag, and he who opened it saw the forehead of an infant, the fairest that ever was seen; and he said, "Behold a radiant brow? " (In the Welsh language, taliesin.) "Taliesin be he called," said Elphin. And he lifted the bag in his arms, and, lamenting his bad luck, placed the boy sorrowfully behind him. And he made his horse amble gently, that before had been trotting, and he carried him as softly as if he had been siting in the easiest chair in the world. And presently the boy made a Consolation, and praise to Elphin; and the Consolation was as you may here see: