The schools of the cathedrals and principal monasteries contributed essentially to the increase and diffusion of literature. Among the monasteries, those of Fulda, St. Gall, Corbie and Kershaw, were particularly renowned. Bishops and abbots exerted themselves to procure books, and to have copies of them made and circulated: they were often splendidly illuminated. Henry I. caused a painting to be made, of a battle which he had gained over the Hungarians. Bernard, bishop of Hildersheim, in imitation of what he had seen in Italy, ornamented the churches of his diocese with mosaic paintings; he also introduced, among his countrymen, the art of fusing and working metals; he caused precious and highly ornamented vases to be made in imitation of the antients. Large and small bells were cast; chalices, patines, incensories, images, and even altars of gold and silver, or ornamented with them, were fabricated. Aventin relates, that at Mauverkirchen, in Bavaria, figures in plaster, hardened by fire, had, in 948, been made of a duke of Bavaria and his general. [Sidenote: 911-1024.] The establishment of schools, and the protection given to the arts and sciences, invited the whole body of the nation to the acquisition of useful and ornamental knowledge; but the invitation was not even generally accepted. There was much superstition in every order of the laity. An opinion prevailed among them, that the world was to end, and the day of judgment arrive, in the year 1000. An universal panic spread itself over Europe. Strange to relate, the people sought to avoid the catastrophe, by hiding themselves in caverns and tombs. The existence of this ignorance cannot be denied: but, to the ecclesiastics, who strove against it, who erected and fostered so many schools to dispel it, and who exerted themselves in the manner we have mentioned, to establish another and a better order of things, a great share of praise and gratitude should never be denied. The mines of Hartz were discovered in the time of Otho I. and diffused so much wealth over Saxony, and afterwards over all Germany, as gave the reign of that emperor the appellation of "the age of gold." Before this time, Nicephorus Phocas had called Saxony, from the dress, or rather the coverings of its inhabitants, "the land of skins." But all the wealth of the country still continued to be concentrated among the great landowners. III. 1. _Boundaries and State of Germany during the Franconian Dynasty._ 1024-1138. Under Henry III. the second prince of this line, the German empire had its greatest extent. It comprised Germany, Italy, Burgundy and Lorraine. Poland, and other parts of the Sclavonian territories, were subject to it. Denmark and Hungary acknowledged themselves its vassals.