"I am aware that I shall describe some things that will seem to the reader to be either impossible or ridiculous. But I protest solemnly that I have put down nothing in this book the truth of which I have not found out either by the testimony of my own eyes, or that of reliable men found worthy of credence and coming from the districts in which the events took place."
One of his tales about flora and fauna includes the explanation of the barnacle goose.
Another is of the bearded woman (see illustration):
Duvenald, king of Limerick, had a woman with a beard down to her navel, and also, a crest like a colt of a year old, which reached from the top of her neck down her backbone, and was covered with hair. The woman, thus remarkable for two monstrous deformities, was ... in other respects had the parts of a woman; and she constantly attended the court, an object of ridicule as well as of wonder. The fact of her spine being covered with hair, neither determined her gender to be male or female; and in wearing a long beard she followed the customs of her country, though it was unnatural in her. [Chapter 20]
He also tells the story—and this may have the ring of truth—of an island that appears and disappears:
One calm day, a large mass of earth rose to the surface of the sea, where no land had ever been seen before, to the great amazement of the islanders who observed it. Some of them said that it was a whale, or other immense sea-monster; others remarking that it continued motionless, said, "No, it is land". In order therefore to reduce their doubts to certainty, some picked young men of the island determined to approach near the spot in a boat. When however, they came so near to it that they thought they should go on shore, the island sank in the water and entirely vanished from sight. The next day it re-appeared, and again mocked the same youths with the like delusion. At length, upon their rowing towards it on the third day, they followed the advice of an older man and let fly an arrow, barbed with red-hot steel, against the island; and then landing, found it stationary and habitable. [Chapter XII]
The beginning of the story makes one think it will turn into another anecdote of Fastitocalon, but the tales of St. Brendan make me think it is possible that the seafaring Hibernians sailed far enough westward and northward to see a volcanic eruption forming an island, as the 20th century saw the new island of Surtsey form off the southern coast of Iceland.
Gerald had a more kindly attitude toward his homeland of Wales, and that will be our next topic.