And when the lady felt that he was sleeping, she got up carefully and with her wimple drew a circle all about Merlin and the bush, and she began to cast her spells. Then she sat down again beside him, took his head in her lap, and held him there until he awoke. And he looked about him, and it seemed to him that he was in the most beautiful tower in the world, and he found himself lying in the most beautiful bed he had ever lain in. Then he asked the young lady, “Lady, you have indeed tricked me if you do not stay with me, for no one but you has the power to undo this tower.”

Vulgate Merlin