Passage 8.14.8
διέχεαν δὲ χαλκὸν πρῶτοι καὶ ἀγάλματα ἐχωνεύσαντο Ῥοῖκός τε Φιλαίου καὶ Θεόδωρος Τηλεκλέους Σάμιοι. Θεοδώρου δὲ ἔργον ἦν καὶ ἡ ἐπὶ τοῦ λίθου τῆς σμαράγδου σφραγίς, ἣν Πολυκράτης ὁ Σάμου τυραννήσας ἐφόρει τε τὰ μάλιστα καὶ ἐπʼ αὐτῇ περισσῶς δή τι ἠγάλλετο.
The Samians Rhoecus, son of Philaeus, and Theodorus, son of Telecles, were the first to cast bronze and to pour statues. The work of Theodorus also was the engraved emerald seal set in gold which Polycrates, who ruled as tyrant of Samos, customarily wore and upon which he took particularly great pride.