Kilydd the son of Prince Kelyddon desired a wife as a helpmate, and the wife that he chose was Goleuddydd, the daughter of Prince Anlawdd.  And after their union, the people put up prayers that they might have an heir.  And they had a son through the prayers of the people.  From the time of her pregnancy Goleuddydd became wild, and wandered about, without habitation; but when her delivery was at hand, her reason came back to her.  Then she went to a mountain where there was a swineherd, keeping a herd of swine.  And through fear of the swine the queen was delivered.  And the swineherd took the boy, and brought him to the palace; and he was christened, and they called him Kilhwch, because he had been found in a swine's burrow.  Nevertheless the boy was of gentle lineage, and cousin unto Arthur; and they put him out to nurse. (Mabinogion, Guest, 1910)