Plaque from a Reliquary early 13th century Workshop of the Master of the Virgin Mary's Reliquary Casket German Although subtle variations of pattern and color distinguish these three plaques from one another, they once formed part of the decoration of a single reliquary. Roman numerals scratched into the reverse indicated where they were to be set, with other figural and decorative elements, on a large house-shaped shrine or other devotional object.. Plaque from a Reliquary. Workshop of the Master of the Virgin Mary's Reliquary Casket (German, Aachen). German. early 13th century. Champlevé and cloisonné enamel, copper-gilt. Made in Cologne, Germany. Enamels