Not merely the exact author or authors, but even the exact source or sources of this complicated, fateful, and exquisite imagination are, once more, not known. Years ago it was laid down finally by the most competent of possible authorities (the late Sir John Rhys) that "the love of Lancelot and Guinevere is unknown to Welsh literature." Originals for the "greatest knight" have been sought by guesswork, by idle play on words and names, if not also by positive forgery, in that Breton literature which does not exist. There do exist versions of the story in which Lancelot plays no very prominent part, and there is even one singular version--certainly late and probably devised by a proper moral man afraid of scandal--which makes Lancelot outlive the Queen, quite comfortably continuing his adventurous career (this is perhaps the "furthest" of the Unthinkable in literature), and (not, it may be owned, quite inconsistently) hints that the connection was merely Platonic throughout. These things are explicable, but better negligible. For my own part I have always thought that the loves of Tristram and Iseult (which, as has been said, were originally un-Arthurian) suggested the main idea to the author of it, being taken together with Guinevere's falseness with Mordred in the old quasi-chronicle, and perhaps the story of the abduction by Melvas (Meleagraunce), which seems to be possibly a genuine Welsh legend. There are in the Tristram-Iseult-Mark trio quite sufficient suggestions of Lancelot-Guinevere-Arthur; while the far higher plane on which the novice-novelist sets his lovers, and even the very interesting subsequent exaltation of Tristram and Iseult themselves to familiarity and to some extent equality with the other pair, has nothing critically difficult in it.