Passage 6.10.3
στεφάνους δὲ λέγεται καὶ ἄλλους Πύθια μὲν δὶς λαβεῖν, Νεμείων δὲ καὶ Ἰσθμίων ὀκτάκις ἐν ἑκατέρῳ ἀγῶνι. τοῦ Γλαύκου δὲ τὴν εἰκόνα ἀνέθηκε μὲν ὁ παῖς αὐτοῦ, Γλαυκίας δὲ Αἰγινήτης ἐποίησε· σκιαμαχοῦντος δὲ ὁ ἀνδριὰς παρέχεται σχῆμα, ὅτι ὁ Γλαῦκος ἦν ἐπιτηδειότατος τῶν κατʼ αὐτὸν χειρονομῆσαι πεφυκώς. ἀποθανόντα δὲ οἱ Καρύστιοι ταφῆναί φασιν αὐτὸν ἐν νήσῳ καλουμένῃ Γλαύκου καὶ ἐς ἡμᾶς ἔτι.
It is said he also won other crowns, twice at the Pythian games and eight times each at the Nemean and Isthmian games. His statue was dedicated by his son; the sculptor who made it was Glaukias of Aegina. The image has the posture of someone engaged in shadow-boxing, because Glaukos was by nature exceptionally skilled in the boxing exercises of his time. According to the Karystians, after his death he was buried on an island called Glaukos, which even in our own day retains his name.