Once as he was lying in his cell he heard two men out abroad discoursing about Wyn Ab Nudd, and saying that he was king of the Tylwyth or Teg Fairies, and lord of Unknown, whereupon Collen thrusting his head out of his cave told them to hold their tongues, for that Wyn Ab Nudd and his host were merely devils.

At dead of night he heard a knocking at the door, and on his asking who was there, a voice said: "I am a messenger from Wyn Ab Nudd, king of Unknown, and I am come to summon thee to appear before my master to-morrow, at mid-day, on the top of the hill." Collen did not go--the next night there was the same knocking and the same message.

Still Collen did not go.

The third night the messenger came again and repeated his summons, adding that if he did not go it would be the worse for him.

The next day Collen made some holy water, put it into a pitcher and repaired to the top of the hill, where he saw a wonderfully fine castle, attendants in magnificent liveries, youths and damsels dancing with nimble feet, and a man of honourable presence before the gate, who told him that the king was expecting him to dinner.