When she fell, the light of her eyes and her sword went out, and the armour all seemed to wither away, and she was nothing but an old ugly woman in rags. And she cried out:

'Thy mercy, good Perceval, son of Evroc, and the mercy of Heaven!'

'How knowest thou, hag,' said he, 'that I am Perceval?'

'By the destiny spun by the powers of the Underworld,' she said, 'and the foreknowledge that I should suffer harm from thee. And I knew not that thou wert here, or I and my sisters would have avoided thee. But it is fated,' she went on, 'that thou come with us to learn all that may be learned of the use of arms. For there are none in Britain to compare with us for the knowledge of warfare.'

Then Perceval remembered what he had heard the trolls—the people of the Underworld—say, though he had not understood their meaning. 'The stainless knight,' they said, 'shall gain from evil greater strength, and with it he may confound all evil.'

'If it be thus fated,' he said, 'I will go with thee. But first thou shalt swear that no evil shall happen to the lady of this castle nor to her daughter, nor to any that belong to them.'

'It shall be so,' said the witch, 'if, when the time comes, thou art strong enough to overcome my power. But if thou failest, Angharad is mine to do with as I will.'

Then Perceval took leave of the lady of the Castle of Weeds, and of Angharad. And the lady thanked him with tears for saving their lives, but the girl was cold and scornful and said no word of thanks. Then Perceval went with the witches to their Castle of Glaive.

He stayed with them for a year and a day, learning such knowledge of arms, and gaining such strength, that it was marvel to see the feats which he performed. And while he lived with them they strove to bend him to their wills, for they saw how great a knight he would become in prowess and in knightly deeds. They tempted him every hour and every day, telling him what earthly power, what riches and what great dominions would be his, if he would but swear fealty to the chief witch, Domna, and fight for her against King Arthur and his proud knights.

Perceval prayed daily for strength to withstand the poison of their tongues, and evermore he held himself humble and gentle, and thought much of his widowed mother in her lonely home in the northern wastes, and of the promise he had made her. Sometimes he thought of Angharad, how beautiful she was, and how sad it was that she had so cold a heart, and was so cruel in her words.