https://www.ancient-origins.net/news-history-archaeology/aristotles-divers-copper-00102324
Historical evidence suggests that copper from Heybeliada was shipped to Sicyon, home to a renowned sculpture school that trained masters including Lysippos, the official sculptor of Alexander the Great. Lysippos revolutionized Greek sculpture with his naturalistic style and innovative proportions, creating works that became defining images of the Hellenistic period. Ancient sources indicate that Alexander himself decreed that only Lysippos could create his portraits in bronze, elevating the sculptor to unparalleled prominence.