Magical Transformation
Fionn was once coursing with his dog Bran, when the hare suddenly turned into a lady weeping for the loss of her ring in the lake. Like a gallant, the hero dived down and got it; but all he had for his trouble was to be turned by her into a white-haired old man. On another occasion he was changed into a grey fawn. But Fionn endured the metamorphoses of twenty years as a hog, one hundred a stag, one hundred an eagle, and thirty a fish, besides living one hundred as a man. The heroine Caer had to be alternate years a swan and a woman.
The Kilkenny Transactions refer to one Liban, transformed for three hundred years as a fish, or, rather a mermaid, with her lap-dog in the shape of an otter after her. Bevan, however, caught her in a net, had her baptized, and then she died. In the Fate of the Children of Lir, we read of Aoife, second wife of Lir, jealous of her husband's children by his first mate, turning them into four swans till her spell could be broken. This happened under the Tuath rule, and lasted nine hundred years. They are reported to have said, "Thou shalt fall in revenge for it, for thy power for our destruction is not greater than the Druidic power of our friends to avenge it upon thee." However, having musical qualities, they enjoyed themselves in chanting every night. At last they heard the bell of St. Patrick. This broke the spell. They sang to the High King of heaven, revealed their name, and cried out, "Come to baptize us, O cleric, for our death is near."