The story of Elidorus was related by Giraldus Cambrensis in his Journey Through Wales (1191). It has been retold many times in folk or faërie story format. Here is Gerald’s account:
Elidorus, when a youth of twelve years, and learning his letters, in order to avoid the discipline and frequent stripes inflicted on him ran away, and concealed himself under the hollow bank of a river. After fasting in that situation for two days, two little men of pigmy stature appeared to him, saying, "If you will come with us, we will lead you into a country full of delights and sports. Assenting and rising up, he followed his guides through a path, at first subterraneous and dark, into a most beautiful country, adorned with rivers and meadows, woods and plains, but obscure, and not illuminated with the full light of the sun. All the days were cloudy, and the nights extremely dark, on account of the absence of the moon and stars. The boy was brought before the king, and introduced to him in the presence of the court; who, having examined him for a long time, delivered him to his son, who was then a boy. These men were of the smallest stature, but very well proportioned in their make; they were all of a fair complexion, with luxuriant hair falling over their shoulders like that of women. They had horses and greyhounds adapted to their size. They neither ate flesh nor fish, but lived on a diet of milk with saffron. They never took an oath, for they detested nothing so much as lies. As often as they returned from our upper hemisphere, they reprobated our ambition, infidelities, and inconstancies; they had no form of public worship, being strict lovers, as it seemed, of truth. The boy frequently returned to our hemisphere, sometimes by the way he had first gone, sometimes by another: at first in company with other persons, and afterwards alone, and made himself known only to his mother, declaring to her the manners, nature, and state of that people. Being desired by her to bring a present of gold, with which that region abounded, he stole, while at play with the king's son, the golden ball with which he used to divert himself, and brought it to his mother in great haste; and when he reached the door of his father's house, pursued, and was entering it in a great hurry, his foot stumbled on the threshold, and falling down into the room where his mother was sitting, the two pigmies seized the ball which had dropped from his hand, and departed, showing the boy every mark of contempt and derision. On recovering from his fall, confounded with shame, and execrating the evil counsel of his mother, he returned by the usual track to the subterraneous road, but found no appearance of any passage, though he searched for it on the banks of the river for nearly the space of a year.