"Well," said Guenever, "ye may depart when ye will."
So early on the morn, ere it was day, she took her horse and rode all that day and most part of the night, and on the morn by noon she came to the abbey of nuns where lay King Arthur. Knowing he was there, she asked where he was at that time; and they answered how he had laid him in his bed to sleep, for he had had but little rest these three nights.
Then she alighted off her horse, and thought for to steal away Excalibur his sword. So she went straight unto his chamber, and no man durst disobey her commandment. There she found Arthur asleep in his bed, and Excalibur in his right hand naked. When she saw that, she was passing heavy that she might not come by the sword without awaking him, and that she wist well would be her death. Then she took the scabbard, and went her way on horseback.
When the King a woke and missed his scabbard, he was wroth, and he asked who had been there. They said his sister Queen Morgan had been there, and had put the scabbard under her mantle, and was gone.
"Alas," said Arthur, "falsely have ye watched me."
"Sir," said they all, "we durst not disobey your sister's commandment."
"Ah," said the King, "let fetch the best horse that may be found, and bid Sir Ontzlake arm him in all haste, and take another good horse and ride with me."
So anon the King and Ontzlake were well armed, and rode after this lady; and so they came by a cross, and asked a cowherd if there came any lady late riding that way.
"Sir," said the poor man, "right late came a lady riding with forty horses, and to yonder forest she rode."
Then they spurred their horses and followed fast. Within a while Arthur had a sight of Morgan le Fay, and he chased as fast as he might. When she espied him following her, she rode a greater pace through the forest till she came to a plain. She saw she might not escape, wherefore she rode unto a lake thereby, and said, "Whatsoever becometh of me, my brother shall not have this scabbard." And then she let throw the scabbard in the deepest of the water, where it sank anon, for it was heavy of gold and precious stones.