From 1422 to 1425 Ian van Eyck was "varlet de chamber" to Duke John of Bavaria, first bishop of Liége, and Regent of Luxembourg, Holland, and Brabant. In 1425 he passed into the service of Philip. He died in 1440. In court service there were besides, Jean de Bruges, David Aubert, Jean Mielot, Jean Wanguelin, Loyset Lyeder, and others connected more or less closely with the Maas valley and the province of Limburg. This valley seems to have been the cradle of Netherlandish miniature art. It is from this neighbourhood that Paris was supplied with craftsmen in the days of the brilliant if reckless administration of the uncles of Philip the Good. There were schools of illuminating artists in Maestricht and Liége, and within a very brief period the style of the Netherlander surpassed that of all competitors for facility, clearness, and realism. A marked feature in this mastery is the free use of architectural and sculptural design. All Gothic draperies are in some degree sculpturesque, and in miniatures we find sculpture to be the ruling principle. Perhaps it was the practice of uniting the crafts of painter and "imagier" in one person that fostered this peculiarity. But certain it is that Netherlandish illumination, in its border foliages, after the taste for the larger vine and acanthus leaf had superseded the ivy, the drawing is studiously sculpturesque. Many of the Gantois borders are like undercut wood carvings. Even as to colour we find either the gilded wood brown or the stone grey, quite as frequently as gayer colours, and much more so than any natural green. The after-fashion for grisailles or _camaieu gris_ has reference probably rather to stained glass than to carving. Before the fifteenth century we do not often meet with individual illuminators by name, but in the Limburg Chronicle under 1380 is this entry: "There was at this time in Cologne a celebrated painter (he was probably a native of Herle in Limburg), the like of whom was not in the whole of Christendom," and more to his praise. His name was Wilhelm. In the municipal expense book, under 1370-90, page 12, is written, "To Master Wilhelm for painting the Oath Book, 9 marks." The Oath Book still exists, but unfortunately the miniature has been cut out.[53] [53] Woltmann, _Hist. of Painting_, Eng. transl., i. p. 412.