To continue with the television series metaphor, we can argue that the first section was a ‘pilot version’, an episode that set the tone for the rest. The clients wanted to make an impression and, because it would catch the eye immediately, they entrusted the first illuminated page to a reputable painter. He belonged to a group of Ghent illuminators engaged in the profession for several generations, and known under the name ‘Masters of Guillebert de Mets’, who worked for the dukes of Burgundy on a regular basis. He is a late representative of this ‘Mets Group’ and was close to one of its members known as the Master of Margaret of Schorisse. The name comes from one of his clients, an abbess in Nivelles for whom in around 1445 he illuminated a splendid prayer book now kept at the Royal Library of Belgium (KBR) in Brussels.
The large number of assistants to have worked on the Breviary can also be ascribed to the length of the project.
His art was rooted in tradition and seems scarcely influenced at all by the new realism being introduced in the same period by painters such as Jan van Eyck or Rogier van der Weyden, known as the Flemish Primitives. After the calendar, in the large initial letter opening the text of volume 1, King David is kneeling in prayer before an altar with a retable, a piece of liturgical furniture usually placed in a church or chapel. However, the illuminator felt it unnecessary to set the scene in such an environment. The decor is abstract – a tiled floor, a wall and a chequered background – not referring in any degree to a real space. The margin has been decorated with a hybrid figure (half man, half beast), an angel playing a trumpet, a peacock and a depiction of the young David opposite the armoured giant Goliath. The same illuminator also produced a margin on a subsequent page (fol. 48v), but in the middle of the seventh quire a colleague of his took over. Although certainly less renowned, this colleague was much industrious.