It was when Hacon was fourteen years old that the archbishop and earl Skuli sent messengers to Bergen to ask that Inga, his mother, might once more go through the ordeal of iron to satisfy all men of his right to the throne. In answer Hacon summoned the bishops and archbishops and Skuli, together with some of his liegemen, to assemble in the vestry of the church, and spoke to them in this wise:
'It would seem hard to many a king to undergo the ordeal when his rule was established. Before, when my mother offered herself to suffer it, I had not been chosen king, and you all know how it happened that when she came forth the iron was hidden. You know, too, that when we first entered Norway she declared herself ready to undergo the ordeal, but Ingi the king and Hacon the earl answered that none misdoubted, neither was there any need for it. Yet now I will do as you will for three causes. First, that no man may say I have claimed what is not mine by right; second, that I would that my subjects should learn that in all things I strive to content them; and third, that the Judge into whose hands I put myself will fail none whose cause is true. And therefore I go gladly to this judgment.
Then Inga went into the church to fast for three days and three nights, and some men fasted with her, and, twelve watched on the outside as before. But on the Wednesday before the trial was to take place Sigar, one of Skuli's men, skilled in learning, came secretly to good man Dagfinn, Hacon's liegeman, and said thus: 'I know your heart is vexed and sore because of this ordeal, but I can promise to make all things right so that the king's mother shall not suffer.'
'How mean you?' asked Dagfinn who was not minded to talk with the man, not liking his face.
'It is in this wise,' answered Sigar with a cunning look; 'I have only to rub this herb over the hand of Inga and the iron will not harm her, however hot it be.'
'I thank you,' said Dagfinn; 'but tell me what name has this herb, and where I may find it.'
'It grows on every house in Bergen,' replied Sigar, who knew well full that there was no virtue in the herb at all, but thought that Dagfinn was with him in the matter, and that together they might proclaim that Inga had sought the aid of leechcraft, and so discredit her in the eyes of all men. But Dagfinn made as though he would spring on him, and bade him begone while he kept his hands off him. After that Dagfinn told the tale to Inga, and warned her lest she should fall into any snares.
Next morning Hacon the king, and Skuli, and the archbishop, and John Earl of Orkney, and many other notable men, went into the church where the priest said the office. Then the piece of holy iron was taken from the great chest and heated in a brazier under the eyes of all, and when it glowed white, so that none could look on it, the priest drew it forth with long pincers and placed it in Inga's hand. As she took it, Hacon shivered, as if the pain had been his. He alone turned his head away; but the rest never lifted their gaze from the face of Inga, which was calm and peaceful as ever.
'It is enough,' said the priest at last, and Hacon sprang forward as if to go to his mother, when the priest stopped him. 'All is not yet finished; back to your place,' and, standing in front of Inga so that no man could behold her hand, he wound a white cloth many times round it. 'Now you may come,' said the priest, and Hacon went with his mother to her house.