Then fear and trouble came upon Lir, for he surmised that Aoife had wrought evil upon the children. So his horses were yoked and he set out upon his road south-westward, until he reached the shores of Loch Derryvaragh. But as he passed by that water, Fionnuala saw the train of horsemen and chariots, and she cried to her brothers to come near to the shore, "for," said she, "these can only be the company of our father who have come to follow and seek for us."
Lir, by the margin of the lake, saw the four swans and heard them talking with human voices, and he halted and spoke to them. Then said Fionnuala: "Know, O Lir, that we are thy four children, and that she who has wrought this ruin upon us is thy wife and our mother's sister, through the bitterness of her jealousy." Lir was glad to know that they were at least living, and he said, "Is it possible to put your own forms upon you again?" "It is not possible," said Fionnuala, "for all the men on earth could not release us until the woman of the South be mated with the man of the North." Then Lir and his people cried aloud in grief and lamentation, and Lir entreated the swans to come on land and abide with him since they had their human reason and speech. But Fionnuala said, "That may not be, for we may not company with men any longer, but abide on the waters of Erinn nine hundred years. But we have still our Gaelic speech, and moreover we have the gift of uttering sad music, so that no man who hears it thinks aught worth in the world save to listen to that music for ever. Do you abide by the shore for this night and we shall sing to you.
So Lir and his people listened all night to the singing of the swans, nor could they move nor speak till morning, for all the high sorrows of the world were in that music, and it plunged them in dreams that could not be uttered.
Next day Lir took leave of his children and went on to the palace of Bóv the Red. Bóv reproached him that he had not brought with him his children. "Woe is me," said Lir, "it was not I that would not bring them; but Aoife there, your own foster-child and their mother's sister, put upon them the forms of four snow-white swans, and there they are on the Loch of Derryvaragh for all men to see; but they have kept still their reason and their human voice and their Gaelic."
Bóv the Red started when he heard this, and he knew that what Lir had said was true. Fiercely he turned to Aoife, and said, "This treachery will be worse, Aoife, for you than for them, for they shall be released in the end of time, but thy punishment shall be for ever." Then he smote her with a druid wand and she became a Demon of the Air, and flew shrieking from the hall, and in that form she abides to this day.
As for Bóv the Red, he came with his nobles and attendants to the shores of Loch Derryvaragh, and there they made an encampment, and the swans conversed with them and sang to them. And as the thing became known, other tribes and clans of the People of Dana would also come from every part of Erinn and stay awhile to listen to the swans and depart again to their homes; and most of all came their own friends and fellow-pupils from the Hill of the White Field. No such music as theirs, say the historians of ancient times, ever was heard in Erinn, for foes who heard it were at peace, and men stricken with pain or sickness felt their ills no more; and the memory of it remained with them when they went away, so that a great peace and sweetness and gentleness was in the land of Erinn for those three hundred years that the swans abode in the waters of Derryvaragh.
But one day Fionnuala said to her brethren, "Do ye know, my dear ones, that the end of our time here is come, all but this night only?" Then great sorrow and distress overcame them, for in the converse with their father and kinsfolk and friends they had half forgotten that they were no longer men, and they loved their home on Loch Derryvaragh, and feared the angry waves of the cold northern sea. But early next day they came to the lough-side to speak with Bóv the Red and with their father, and to bid them farewell, and Fionnuala sang to them her last lament. Then the four swans rose in the air and flew northward till they were seen no more, and great was the grief among those they left behind; and Bóv the Red let it be proclaimed throughout the length and breadth of Erin that no man should henceforth presume to kill a swan, lest it might chance to be one of the children of Lir.
Far different was the dwelling-place which the swans now came to, from that which they had known on Loch Derryvaragh. On either side of them, to north and south, stretched a wide coast far as the eye could see, beset with black rocks and great precipices, and by it ran fiercely the salt, bitter tides of an ever-angry sea, cold, grey, and misty; and their hearts sank to behold it and to think that there they must abide for three hundred years.