Western Europe made no glass in Mediaeval days: what was used in church and castle all came from the East. In the early inventories, whenever an object of coloured glass is found, it is always accompanied by a mention of its Oriental origin. It is doubtful whether even plain glass was manufactured in England, France, Germany or the Netherlands before the close of the Crusades. The efforts made as late as the fourteenth century by several French and German princes to attract glass-blowers to their dominions shows how scarce they were.
In 1338, we find a feudal noble giving a portion of his forest to a certain Guionet, who was acquainted with the methods of glass-making, to set up a glass factory, on condition of supplying his house every year with one hundred dozen bell glasses, twelve dozen little vase-shaped glasses, twenty dozen hanaps, or cups with feet, twelve amphorae, and other objects. As in all the other industrial arts, Flanders was well to the fore in the manufacture of plain glass. Before 1400, glass factories existed there; but the products were only white glass, not gilded nor enamelled. The Flemish wares, however, were highly prized, and were freely exported to other countries. In 1379, we find in the inventory of Charles V of France: “_Ung gobelet et une aiguière de voirre blant de Flandres garni d’argent_.”
To have glass mounted in silver shows how precious it was considered in those days. Moreover, the royal accounts of the end of the fourteenth century prove that Charles VI accorded high protection and recompense to the Flemish glass-blowers who established their industry in France. Before the end of the fifteenth century, we find entries that would seem to show that the Low Countries were no longer exclusively dependent on the Orient for coloured and enamelled glass. In the inventory of Charles the Bold, Duke of Burgundy (1477), we read: “_Une coupe de voirre jaune garny d’or; ... une couppe de voirre vert garny d’or; ... un pot de voirre de couleur vert, garny d’or; ... un aiguière de voirre vert torssé garny d’or; ... deux petis pots de voirre bleu espez, garnis d’argent doré; ... ung voirre taillé d’un esgle, d’un griffon et d’une double couronne garny d’argent_.” These, however, may have come from Venice, which city had in the latter half of the fifteenth century learned from the Greeks the secret of making coloured, gilded and enamelled glass.