Brandan was sent after a time to other abbeys, where he could pursue especial studies, for they had six branches of learning,—grammar, rhetoric, dialectics, geometry, astronomy, and music. Thus he passed three years, and was then advised to go to an especial teacher in the mountains, who had particular modes of teaching certain branches. But this priest—he was an Italian—was suffering from poverty, and could receive his guest but for a few weeks. One day as Brandan sat studying, he saw, the legend says, a white mouse come from a crack in the wall, a visitor which climbed upon his table and left there a grain of wheat. Then the mouse paused, looked at the student, then ran about the table, went away and reappeared with another grain, and another, up to five. Brandan, who had at the very instant learned his lesson, rose from his seat, followed the mouse, and looking through a hole in the wall, saw a great pile of wheat, stored in a concealed apartment. On his showing this to the head of the convent, it was pronounced a miracle; the food was distributed to the poor, and "the people blessed his charity while the Lord blessed his studies."

In the course of years, Brandan became himself the head of one of the great abbeys, that of Clonfert, of the order of St. Benedict, where he had under him nearly three thousand monks. In this abbey, having one day given hospitality to a monk named Berinthus, who had just returned from an ocean voyage, Brandan learned from him the existence, far off in the ocean, of an island called The Delicious Isle, to which a priest named Mernoc had retired, with many companions of his order. Berinthus found Mernoc and the other monks living apart from one another for purposes of prayer, but when they came together, Mernoc said, they were like bees from different beehives. They met for their food and for church; their food included only apples, nuts, and various herbs. One day Mernoc said to Berinthus, "I will conduct you to the Promised Isle of the Saints." So they went on board a little ship and sailed westward through a thick fog until a great light shone and they found themselves near an island which was large and fruitful and bore many apples. There were no herbs without blossoms, he said, nor trees without fruits, and there were precious stones, and the island was traversed by a great river. Then they met a man of shining aspect who told them that they had without knowing it passed a year already in the island; that they had needed neither food nor sleep. Then they returned to the Delicious Island, and every one knew where they had been by the perfume of their garments. This was the story of Berinthus, and from this time forward nothing could keep Brandan from the purpose of beholding for himself these blessed islands.

Before carrying out his plans, however, he went, about the year 560, to visit an abbot named Enda, who lived at Arran, then called Isle of the Saints, a priest who was supposed to know more than any one concerning the farther lands of the western sea. He knew, for instance, of the enchanted island named Hy-Brasail, which could be seen from the coast of Ireland only once in seven years, and which the priests had vainly tried to disenchant. Some islands, it was believed, had been already disenchanted by throwing on them a few sparks of lighted turf; but as Hy-Brasail was too far for this, there were repeated efforts to disenchant it by shooting fiery arrows towards it, though this had not yet been successful. Then Enda could tell of wonderful ways to cross the sea without a boat, how his sister Fanchea had done it by spreading her own cloak upon the waves, and how she and three other nuns were borne upon it. She found, however, that one hem of the cloak sank below the water, because one of her companions had brought with her, against orders, a brazen vessel from the convent; but on her throwing it away, the sinking hem rose to the level of the rest and bore them safely. St. Enda himself had first crossed to Arran on a large stone which he had ordered his followers to place on the water and which floated before the wind; and he told of another priest who had walked on the sea as on a meadow and plucked flowers as he went. Hearing such tales, how could St. Brandan fear to enter on his voyage?

He caused a boat to be built of a fashion which one may still see in Welsh and Irish rivers, and known as a curragh or coracle; made of an osier frame covered with tanned and oiled skins. He took with him seventeen priests, among whom was St. Malo, then a mere boy, but afterwards celebrated. They sailed to the southwest, and after being forty days at sea they reached a rocky island furrowed with streams, where they received the kindest hospitality, and took in fresh provisions. They sailed again the next day, and found themselves entangled in contrary currents and perplexing winds, so that they were long in reaching another island, green and fertile, watered by rivers which were full of fish, and covered with vast herds of sheep as large as heifers. Here they renewed their stock of provisions, and chose a spotless lamb with which to celebrate Easter Sunday on another island, which they saw at a short distance.

This island was wholly bare, without sandy shores or wooded slopes, and they all landed upon it to cook their lamb; but when they had arranged their cooking-apparatus, and when their fire began to blaze, the island seemed to move beneath their feet, and they ran in terror to their boat, from which Brandan had not yet landed. Their supposed island was a whale, and they rowed hastily away from it toward the island they had left, while the whale glided away, still showing, at a distance of two miles, the fire blazing on his back.

The next island they visited was wooded and fertile, where they found a multitude of birds, which chanted with them the praises of the Lord, so that they called this the Paradise of Birds.

This was the description given of this island by an old writer named Wynkyn de Worde, in "The Golden Legend":—

"Soon after, as God would, they saw a fair island, full of flowers, herbs, and trees, whereof they thanked God of his good grace; and anon they went on land, and when they had gone long in this, they found a full fayre well, and thereby stood a fair tree full of boughs, and on every bough sat a fayre bird, and they sat so thick on the tree that uneath [scarcely] any leaf of the tree might be seen. The number of them was so great, and they sang so merrilie, that it was an heavenlie noise to hear. Whereupon St. Brandan kneeled down on his knees and wept for joy, and made his praise devoutlie to our Lord God, to know what these birds meant. And then anon one of the birds flew from the tree to St. Brandan, and he with the flickering of his wings made a full merrie noise like a fiddle, that him seemed he never heard so joyful a melodie. And then St. Brandan commanded the foule to tell him the cause why they sat so thick on the tree and sang so merrilie. And then the foule said, some time we were angels in heaven, but when our master, Lucifer, fell down into hell for his high pride, and we fell with him for our offences, some higher and some lower, after the quality of the trespasse. And because our trespasse is so little, therefore our Lord hath sent us here, out of all paine, in full great joy and mirthe, after his pleasing, here to serve him on this tree in the best manner we can. The Sundaie is a daie of rest from all worldly occupation, and therefore that day all we be made as white as any snow, for to praise our Lorde in the best wise we may. And then all the birds began to sing evensong so merrilie that it was an heavenlie noise to hear; and after supper St. Brandan and his fellows went to bed and slept well. And in the morn they arose by times, and then those foules began mattyns, prime, and hours, and all such service as Christian men used to sing; and St. Brandan, with his fellows, abode there seven weeks, until Trinity Sunday was passed."

Having then embarked, they wandered for months on the ocean, before reaching another island. That on which they finally landed was inhabited by monks who had as their patrons St. Patrick and St. Ailbée, and they spent Christmas there. A year passed in these voyages, and the tradition is that for six other years they made just the same circuit, always spending Holy Week at the island where they found the sheep, alighting for Easter on the back of the same patient whale, visiting the Isle of Birds at Pentecost, and reaching the island of St. Patrick and St. Ailbée in time for Christmas.

But in the seventh year they met with wholly new perils. They were attacked, the legend says, first by a whale, then by a griffin, and then by a race of cyclops, or one-eyed giants. Then they came to an island where the whale which had attacked them was thrown on shore, so that they could cut him to pieces; then another island which had great fruits, and was called The Island of the Strong Man; and lastly one where the grapes filled the air with perfume. After this they saw an island, all cinders and flames, where the cyclops had their forges, and they sailed away in the light of an immense fire. The next day they saw, looking northward, a great and high mountain sending out flames at the top. Turning hastily from this dreadful sight, they saw a little round island, at the top of which a hermit dwelt, who gave them his benediction. Then they sailed southward once more, and stopped at their usual places of resort for Holy Week, Easter, and Whitsuntide.