The Most Ancient Lives of Saint Patrick/The Life and Acts of St. Patrick/Chapter 169
Of the Threefold Plagues of Hibernia.
Even from the time of its original inhabitants, did Hibernia labor under a threefold plague: a swarm of poisonous creatures, whereof the number could not be counted; a great concourse of demons visibly appearing; and a multitude of evil-doers and magicians. And these venomous and monstrous creatures, rising out of the earth and out of the sea, so prevailed over the whole island that they not only wounded men and animals with their deadly sting, but slayed them with cruel bitings, and not seldom rent and devoured their members. And the demons, who by the power of idolatry dwelled in superstitious hearts, showed themselves unto their worshippers in visible forms; often likewise did they, as if they were offended, injure them with many hurts; unto whom, being appeased with sacrifices, offerings, or evil works, they seemed to extend the grace of health or of safety, while they only ceased from doing harm. And after was beheld such a multitude of these, flying in the air or walking on the earth, that the island was deemed incapable of containing so many; and therefore was it accounted the habitation of demons, and their peculiar possession. Likewise the crowd of magicians, evil-doers, and soothsayers had therein so greatly increased as the history of not any other nation doth instance.