This is an ivory plaque from a set of writing tablets, originating from Germany, Mosan or Rheinsh, made in about 1370-1400.
Ivory was used all over Europe for religious works of art. It was often combined with precious metals and usually took the form of relief panels, for book covers, portable altars and caskets. An almost unbroken tradition of ivory carving extends from the Roman and Byzantine empires until the end of the 14th century. From about 1250, Paris became the centre of production for figures and reliefs intended for private devotion. Ivory covers for writing tablets survive in good numbers from the fourteenth century. Wax writing tablets or panels of a hard material filled with layers of wax that could be inscribed with a stylus, were common in Antiquity and continued in use throughout the early Middle Ages.
They were particularly useful for note taking, given their portability and the fact that their surfaces could be erased and reused. The majority of such tablets would have been made of wood, although other materials such as gold, silver, bone and ivory were also used. In most cases the tablets formed part of a group of up to eight panels, only the covers of which were carved with imagery on their outer faces. The imagery on most surviving tablets and boxes derives primarily from diptychs, with a quality of carving lower than that commonly found on diptychs, at least partly as a result of the thinner ivory material on the tablets.