Finnian, the Abbott of Moville, travels to the home of Tuan mac Cairill and compels Tuan to admit him. The abbott convinces Tuan of the truth of the Gospel. Finnian asks Tuan to describe his past. Tuan reveals that he is centuries old and was one of the original settlers of Ireland. Tuan lost consciousness in a violent storm and woke to find himself transformed into a powerful stag. Tuan passes through a number of lives: as a stag, a boar, a hawk, and a salmon. As a salmon, Tuan is caught, roasted, and eaten by the queen of Ireland. He is reborn as her son.
