Églomisé is a French term meaning a design which is hand-painted and gilded on the reverse of glass, producing a mirror-like finish on the face. The technique dates to pre-Roman times, and was notably utilized by Italian artisans of the Renaissance in reliquaries and altars. Églomisé was revived by 18th-century French decorator Jean-Baptiste Glomy (1711–1786), from whom it was named. He popularized glass painted decor, which was later used in shop decor and advertising.
 
This set of 4 gods from ancient Western mythology were bought at auction. I believe they are French or Italian. Featured are Diana, Apollo, Demeter, Mars and Venus. The carved frames are slightly loose; please see photos.