Plato, Letters 360c

ᾧ γε σὺ καὶ Ἀρχύτης, εἴπερ ἥκει παρά σε Ἀρχύτης, χρῆσθαι δύναισθʼ ἄν. ἔστι δὲ ὄνομα μὲν Ἑλίκων, τὸ δὲ γένος ἐκ Κυζίκου, μαθητὴς δὲ Εὐδόξου καὶ περὶ πάντα τὰ ἐκείνου πάνυ χαριέντως ἔχων· ἔτι δὲ καὶ τῶν Ἰσοκράτους μαθητῶν τῳ συγγέγονεν καὶ Πολυξένῳ τῶν Βρύσωνός τινι ἑταίρων. ὃ δὲ σπάνιον ἐπὶ τούτοις, οὔτε ἄχαρίς ἐστιν ἐντυχεῖν οὔτε κακοήθει ἔοικεν, ἀλλὰ μᾶλλον ἐλαφρὸς καὶ εὐήθης

you and Archytas—if Archytas has come to your court—may be able to make use. His name is Helicon, he is a native of Cyzicus, and he is a pupil of Eudoxus and exceedingly well versed in all his doctrine. Moreover, he has associated with one of the pupils of Isocrates and with Polyxenus, one of Bryson’s companions; and, what is rare in these cases, he is not without charm of address nor is he of a churlish disposition; rather he would seem to be gay and