In the _Félire na Naomh Nerennach_ is a strangely beautiful if fantastic legend of one Mochaoi, Abbot of n'-Aondruim in Uladh. With some companions he was at the edge of a wood, and while busy in cutting wattles wherewith to build a church, "he heard a bright bird singing on the blackthorn near him. It was more beautiful than the birds of the world." Mochaoi listened entranced. There was more in that voice than in the throat of any bird he had ever heard, so he stopped his wattle-cutting, and, looking at the bird, courteously asked who was thus delighting him. The bird at once answered, "A man of the people of my Lord" (that is, an angel). "Hail," said Mochaoi, "and for why that, O bird that is an angel?" "I am come here by command to encourage you in your good work, but also, because of the love in your heart, to amuse you for a time with my sweet singing." "I am glad of that," said the saint. Thereupon the bird sang a single surpassing sweet air, and then fixed his beak in the feathers of his wing, and slept. But Mochaoi heard the beauty and sweetness and infinite range of that song for three hundred years. Three hundred years were in that angelic song, but to Mochaoi it was less than an hour. For three hundred years he remained listening, in the spell of beauty: nor in that enchanted hour did any age come upon him, or any withering upon the wattles he had gathered; nor in the wood itself did a single leaf turn to a red or yellow flame before his eyes. Where the spider spun her web, she spun no more: where the dove leaned her grey breast from the fir, she leaned still. Then suddenly the bird took its beak from its wing-feathers, and said farewell. When it was gone, Mochaoi lifted his wattles, and went homeward as one in a dream. He stared, when he looked for the little wattled cells of the Sons of Patrick. A great church built of stone stood before his wondering eyes. A man passed him, and told the stranger that it was the church of St. Mochaoi. When he spoke to the assembled brothers, none knew him: some thought he had been taken away by the people of the Shee, and come back at fairy-nightfall, which is the last hour of the last day of three hundred years. "Tell us your name and lineage," they cried. "I am Mochaoi, Abbot of n'-Aondruim," he said, and then he told his tale, and they knew him, and made him abbot again. In the enchanted wood a shrine was built, and about it a church grew, "and surpassingly white angels often alighted there, or sang hymns to it from the branches of the forest trees, or leaned with their foot on tiptoe, their eyes on the horizon, their ear on the ground, their wings flapping, their bodies trembling, waiting to send tidings of prayer and repentance with a beat of their wings to the King of the Everlasting."