 Medallists are also often confusingly referred to as "engravers" in reference works, referring to the "engraving" of dies, although this is often in fact not the technique used; however many also worked in engraving the technique in printmaking.Art medals have been produced since the late Renaissance period, and, after some classical precedents and Late Medieval revivals, the form was essentially invented by Pisanello, who is credited with the first portrait medal, which has remained a very popular type.He cast them like bronze sculptures, rather than minting them like coins.