A medallion is a round or oval ornament[1] that frames a sculptural or pictorial decoration in any context, but typically a façade, an interior, a monument, or a piece of furniture or equipment.
The frame and portrait were carved as one, in marble for interiors, and in stone for exterior walls.
It is also the name of a scene that is inset into a larger stained glass window.
Many Art Deco medallions are octagonal, showing the use of angular and stylized shapes that characterize the style, inspired by Cubism.
For example, some medieval Moldavian churches are decorated with colourful medallions that feature animals and mythological creatures, while many oval Neoclassical ones feature profiles, inspired by Roman cameos.