The "medieval" character of the work of Chrestien and his contemporaries is plain enough. But "medieval" and other terms of the same sort are too apt to impose themselves on the mind as complete descriptive formulas, and in this case the term "medieval" ought not to obscure the fact that it is modern literature, in one of its chief branches, which has its beginning in the twelfth century. No later change in the forms of fiction is more important than the twelfth-century revolution, from which all the later forms and constitutions of romance and novel are in some degree or other derived. It was this revolution, of which Chrestien was one of the first to take full advantage, that finally put an end to the old local and provincial restrictions upon narrative. The older schools of epic are bound to their own nation or tribe, and to the family traditions. These restrictions are no hindrance to the poetry of Homer, nor to the plots and conversations of the Sagas. Within these local restrictions the highest form of narrative art is possible. Nevertheless the period of these restrictions must come to an end; the heroic age cannot last for ever. The merit of the twelfth-century authors, Benoit, Chrestien, and their followers, is that they faced the new problems and solved them. In their productions it may be seen how the Western world was moving away from the separate national traditions, and beginning the course of modern civilisation with a large stock of ideas, subjects, and forms of expression common to all the nations. The new forms of story might be defective in many ways, thin or formal or extravagant in comparison with some of the older modes; but there was no help for it, there was no progress to be made in any other way.