There are several stages in the history of the great Romantic School, as well as several distinct sources of interest. The value of the best works of the school consists in their representation of the passion of love. They turn the psychology of the courtly amatory poets into narrative. Chaucer's address to the old poets,--"Ye lovers that can make of sentiment,"--when he complains that they have left little for him to glean in the field of poetry, does not touch the lyrical poets only. The narrative poetry of the courteous school is equally devoted to the philosophy of love. Narrative poets like Chrestien, when they turn to lyric, can change their instrument without changing the purport of their verse; lyric or narrative, it has the same object, the same duty. So also, two hundred years later, Chaucer himself or Froissart may use narrative or lyric forms indifferently, and observe the same "courteous" ideal in both. In the twelfth-century narratives, besides the interest of the love-story and all its science, there was the interest of adventure, of strange things; and here there is a great diversity among the authors, and a perceptible difference between earlier and later usage. Courteous sentiment, running through a succession of wonderful adventures, is generally enough to make a romance; but there are some notable varieties, both in the sentiment and in the incidents. The sentiment comes later in the history of literature than the adventures; the conventional romantic form of plot may be said to have been fixed before the romantic sentiment was brought to its furthest refinement. The wonders of romantic story are more easily traced to their origin, or at least to some of their earlier forms, than the spirit of chivalrous idealism which came in due time to take possession of the fabulous stories, and gave new meanings to the lives of Tristram and Lancelot.