The revival of the Roman Empire in the West made no difference in Charlemagne's system of government, except that he required all his subjects above twelve years of age to take a new oath of fidelity to him as emperor. He held important assemblies of the nobles and prelates each spring or summer, where the interests of the Empire were considered. With the sanction of his advisers, he issued an extraordinary series of laws, called _capitularies_, a number of which have been preserved. With the bishops and abbots he discussed the needs of the Church, and above all the necessity of better schools for both the clergy and laity. The reforms which he sought to introduce give us an opportunity of learning the condition in which Europe found itself after four hundred years of disorder. [Sidenote: The dark century before Charlemagne.] 34. Charlemagne was the first important king since Theodoric to pay any attention to book learning, which had fared badly enough since the death of Boethius, three centuries before. About 650 the supply of papyrus had been cut off, owing to the conquest of Egypt by the Arabs, and as paper had not yet been invented there was only the very expensive parchment to write upon. While this had the advantage of being more durable than papyrus, its cost discouraged the multiplication of copies of books. The eighth century, that immediately preceding Charlemagne's coronation, is declared by the learned Benedictine monks, in their great history of French literature, to have been the most ignorant, the darkest, and the most barbarous period ever seen, at least in France. The documents of the Merovingian period often indicate great ignorance and carelessness on the part of those who wrote them out. [Sidenote: The elements of learning preserved by the Church.] Yet, in spite of this dark picture, there was promise for the future. It was evident, even before Charlemagne's time, that the world was not to continue indefinitely in the path of ignorance. Latin could not be forgotten, for that was the language of the Church and all its official communications were in that tongue. The teachings of the Christian religion had to be gathered from the Bible and other books, and the church services formed a small literature by themselves. Consequently it was absolutely necessary that the Church should maintain some sort of education in order to perform its complicated services and conduct the extensive duties which devolved upon it. All the really efficient church officers, whatever their nationality, must have been able to read the Latin classics, if they were so inclined. Then there were the compilations of ancient knowledge already mentioned,[49] which, incredibly crude and scanty as they were, kept up the memory of the past. They at least perpetuated the names of the various branches of knowledge and contained, for example, enough about arithmetic and astronomy to help the isolated churchman to calculate each year the date of Easter.