By the beginning of the twelfth century, the West seems to have become lastingly independent of the East, even with regard to its ornaments, as may be inferred from various remarkable productions in gold and silver, and particularly in gilded copper adorned with champlevé enamel, such as shrines and other sacred objects. Many of these are still preserved in the ecclesiastical treasuries of Germany, while museums at home and abroad all possess beautiful examples. Though the personal ornaments of this period are now almost entirely lost to us in the original, there has yet been preserved a treasure of inestimable value in the form of a technological manual handed down from the Middle Ages. The work referred to is the famous treatise of Theophilus entitled _Schedula Diversarum Artium_, which describes the technical processes of almost all the industrial arts cultivated eight centuries ago--the treatise being written shortly before the year 1100.[30] After describing his workshop, Theophilus mentions his tools, and proceeds to describe minutely the various processes necessary for the metal-worker to understand; and shows how the goldsmith was required to be at the same time a modeller, sculptor, smelter, enameller, jewel-mounter, and inlay-worker. Altogether, to judge from the directions there given, more especially those relating to the technical work of the goldsmiths, these _Schedulæ_ would seem to reflect the ancient knowledge and practices of Byzantine workmen, of which, however, the goldsmiths of the twelfth century appear to have become completely independent. [30] Ilg (A.), _Theophilus Presbyter_, p. xliii. The perfection of artistic work attained by the monasteries led to the production of sumptuous objects to meet the requirements of the Church in connection with its services, while costly shrines were made to contain the numerous relics brought home by pilgrims from the Holy Land. During the period of the Romanesque and early Gothic styles personal ornaments became objects of lesser importance than articles for ecclesiastical use.[31] The enamel-work for the decoration of ornaments was mostly executed at Limoges, which was then rising to importance as the chief centre for the production of enamels. The process employed was champlevé, generally upon copper. Such ornaments as buckles, and brooches or morses, for the belts of knights or the vestments of ecclesiastics, were produced in considerable numbers at Limoges, and found their way all over the north-west of Europe. The trade-guilds of Limoges were probably more active in this kind of enamel than those situated upon the banks of the Rhine, whose work seems to have been devoted principally to shrines and objects for the use of the Church. Ornaments of the above types were executed during the greater part of the twelfth century and throughout the thirteenth, but their manufacture ceased in the century following, when Limoges was sacked by the Black Prince.