This period has been described as "one that shone out at once over Provence and all the south of Europe, like an electric flash in the midst of profound darkness, illuminating all things with the splendor of its flame."

During the Crusades many of the Troubadours departed for the Holy Land. In the history of the world there is no event that fired the poetry and imagination of the people like these holy wars, and religious enthusiasm began to influence the poetry of the time. When the Plantagenet kings of England assumed by right the sovereignty over Languedoc (as Provence was called), a new impetus was given to the Provencal poetry, as well as a wider scope, when it was introduced into England. Chaucer, the father of English literature, found in the Provencal literature all his first models.

With the decline of the Troubadours occurred the rise of the Trouveres in northern France.

In the tenth century Normandy was invaded by Rollo the Dane, who incorporated himself and his followers with the Normans. They adopted the Norman-French; but gave it a power and scope it had hitherto lacked. While the Romance-Provencal in the South was a language of sweetness and beauty, the Northern language after the advent of Rollo, was strong and warlike. Its poetry, which differed from the love chansons of the South, was the song of brave warriors, recounting the heroic deeds of their ancestors.

The Langue d'oui, as this Northern speech was called, became, in the twelfth century, the universal medium of literature. The poets and story writers called themselves Trouveres, and they invented the fabliaux, the dramatic mysteries and romances of ancient chivalry. The first great literary work of this class is a marvellous history of the early kings of England, commencing with Brutus, a grandson of Aeneas, who, sailing among many enchanted Isles, at length settles in England, where he meets Arthur of the Round Table, and the old wizard, Merlin, one of the most popular creations of the Middle Ages. Born of this legend were some of the best known of modern romances. The word romance, which in the early history of France was used to distinguish the common dialect from the Latin, was later applied to all imaginative and inventive tales. Of this class was "Tristam de Leonois," written in 1190; the "San Graal," and "Lancelot." In the same century appeared "Alexander," a poem which became so celebrated that poetry, written in the same measure, is to this day called Alexandrine verse.

A poetess known as Marie of France, wrote twelve lays to celebrate the glories of the Round Table. She addresses herself to a king supposed to be Henry VI, and has made extensive use of early British legends. Chaucer and other English poets, have drawn many inspirations from her poems.

The Trouveres not only originated the romances of chivalry; but they also invented allegorical poems. The most celebrated is the "Romance of the Rose," written in the thirteenth century. It consisted of 20,000 verses, and although tedious, because of its length, it was universally admired, and became the foundation of all subsequent allegory among the different nations. The poetry of the Trouveres was unlike anything in antiquity, and unlike, too, to what came after it. It dealt with high-minded love and honor, the devotion of the strong to the weak, and the supernatural in fiction. All this, which formed part of its composition, has been attributed to both the Arabians and the Germans; but it was in truth a peculiar production of the Normans, the most active and enterprising people in Europe, a nation who pushed into Russia, Constantinople, England, France, Sicily and Syria. A treasury of a later date, from which the Trouveres drew their fabliaux in the thirteenth century, was a collection of Indian tales that had been translated into Latin in the tenth century. These fabliaux show that inventiveness, gaiety, and simple, yet delightful esprit, which is found nowhere but among the French. The Arabian tales, which had found their way into France, were also turned into verse, while the anecdotes that were picked up in the castles and towns of France, furnished other material for the fabliaux. These tales were the common property of the country at large, and are the source from which Boccaccio, La Fontaine, and others drew their inspiration. Some of them became famous and have been passed down from one age to another.

The Renard of Goethe, and the Zaire of Voltaire were taken from the old fabliaux. In the fourteenth century the coming of the Popes and the Roman Court to Avignon introduced an Italian element, and the language of Tuscany took the place of the Provencal among the upper classes.

La Fontaine, called the "Prince of Fablists," appeared in the seventeenth century. Many of his fables were borrowed from ancient sources; but clothed in a new dress. He has been closely imitated by his Confreres and by the fablists of other nations; but has easily remained the most renowned of them all.

The philosophy of Descartes in the sixteenth century prepared the way for Locke, Newton and Leibnitz; and his system, although now little used, was really the foundation of what followed. He is said to have given new and fresher impulse to mathematical and philosophical study than any other student, either ancient or modern.