The belief that Arthur would return to earth, which was firmly established among the Britons by the beginning of the twelfth century, does not in early records appear clothed in any definite narrative form. In later sources it assumes several phases, the most common of which is that recorded by Layamon that Arthur had been taken by fays from his final battle-field to Avalon, the Celtic otherworld, whence after the healing of his mortal wound he would return to earth. Layamon's story conforms essentially to an early type of Celtic fairy-mistress story, according to which a valorous hero, in response to the summons of a fay who has set her love upon him, under the guidance of a fairy messenger sails over seas to the otherworld, where he remains for an indefinite time in happiness, oblivious of earth. It is easy to see that the belief that Arthur was still living, though not in this world, might gradually take shape in such a form as this, and that his absence from his country might be interpreted as his prolonged sojourn in the distant land of a fairy queen, who was proffering him, not the delights of her love, but healing for his wounds, in order that when he was made whole again he might return "to help the Britons." Historic, mythical, and romantic tradition have combined to produce the version that Layamon records. Geoffrey of Monmouth (xi. 2), writing in the mock role of serious historian and with a tendency to rationalisation, says not a word of the wounded king's possible return to earth. Wace, with characteristic caution, affirms that he will not commit himself as to whether the Britons, who say that Arthur is still in Avalon, speak the truth or not. Here, as in the story of the Round Table, it is Layamon who has preserved for us what was undoubtedly the form that the belief had already assumed in Celtic story, through whatever medium it may have passed before it reached his hands. In the _Vita Merlini_,[21] a Latin poem attributed by some scholars to Geoffrey of Monmouth, a curious version of Arthur's stay in Avalon is given. The wounded king is taken after the battle of Camlan to the Isle of Apples (for such was understood to be the meaning of the name _Avalon_), which is the domain of a supernatural maiden, wise and beautiful, Morgen by name, who understands the healing art, and who promises the king that he shall be made whole again if he abides long with her. This is the first mention in literature of Morgan la Fée, the most powerful fay of French romance, and regularly the traditional healer of Arthur's wounds in Avalon.