Herodotus
1. Cilo, § 171
(“Καὶ σφι τριξὰ ἐξέυρήματα ἐγένετο — τὰ σημήϊα ποιὲεσθαι.”)
“And to them is allowed the invention of three things, which have come into use among the Greeks:—For the Carians seem to be the first who put crests upon their helmets and sculptured devices upon their shields.”