Pyrgoteles
Pyrgoteles was one of the most celebrated gem-engravers of ancient Greece, living in the latter half of the 4th century BC. The esteem in which he was held may be inferred from an edict of Alexander the Great, which placed him on a level with Apelles and Lysippos, by naming him as the only artist who was permitted to engrave signet rings for the king.
Works
Pyrgoteles was one of the three court artists authorized to depict Alexander the Great's figure in art. Pliny the Elder adds that Alexander had issued an edict forbidding anyone to engrave his image on emeralds, and other gems, outside of Pyrgoteles.Unfortunately, every thing else respecting Pyrgoteles is left to the unknown, due to the neglect of ancient writers and modern forgers, lack of remains, and so many copies coming out of that same time period. There are several works under the name of Pyrgoteles, but of these the best known have been demonstrated by Winckelmann to be forgeries, and very few of the others have any signs to authenticity due to the mass production of pieces with the name Pyrgoteles on them or just a "P".
Despite the large impact that Pyrgoteles contributed to Alexander's imagery in the ancient world, we are today unable to identify all that much of his actual output. No signed pieces of his survive, or are able to be deemed authentic; however, when comparing sources this seems to be up in the air. With some sourcing speaking of his forgeries as if authentic and others only giving Prygoteles the label of gem engraver to Alexander. Various texts suggest that next to gem-engraving, Pyrgoteles was responsible for coin dies as well, and coinage was one of the main forms of propaganda and marketing of images in the ancient times. Coinage was the standard medium for diffusing royal imagery in the Hellenistic period and allowed emperors to be remembered and altered to fit the aspects of culture in said time periods. Alexander never had his actual portrait cut on his coins during his lifetime; however, after his image was highly produced in the later years after his death, though it is possible that Pyrgoteles was responsible for designing Alexander's first coin dies, which depict Herakles, Alexander's patron god, in dedication to Alexander. Following Alexander's premature death, Pyrgoteles would have most likely continued his career in the courts of his successors, which we know as Lysippos and Apelles, who shows up in much of the literature pertaining to Prygoteles, and are often associated with being his disciples and predecessors.