The King answered: "You shall be guest here, whatever you are called."
Guest said: "I have told you my name truly, Sire, and I will gladly receive your hospitality if I may."
The King told him he could have it readily. But since the day was far spent, the King would not enter into conversation with his guest; for he was going soon to vespers, and after that to dinner, and then to bed and to sleep.
Now on that same night King Olaf Tryggvason was lying awake in his bed and saying his prayers, while all the other men in the hall were asleep. Then the King noticed that an elf or spirit of some kind had come into the hall, though all the doors were locked. He made his way past the beds of the men who were asleep there, one after another, and at last reached the bed of a man at the far end.
Then the elf stopped and said: "An empty house, and a mighty strong bolt on the door! People say that the King is the wisest of men. If he were as clever in things of this kind as they say he would not sleep so soundly."
After that he vanished through the door, locked as it was.
Early next morning the King sent his servant to find out who had occupied that bed over night, and it proved to have been the stranger. The King ordered him to be summoned before him and asked him whose son he was.
He answered: "My father's name was Thorth. He was a Dane and was called 'The Contentious,' and lived at a place called Groening in Denmark."
"You are a well set-up man," said the King.