Plato, Letters 360a

Πλάτων Διονυσίῳ τυράννῳ Συρακουσῶν εὖ πράττειν.ἀρχή σοι τῆς ἐπιστολῆς ἔστω καὶ ἅμα σύμβολον ὅτι παρʼ ἐμοῦ ἐστιν· τοὺς Λοκρούς ποθʼ ἑστιῶν νεανίσκους, πόρρω κατακείμενος ἀπʼ ἐμοῦ, ἀνέστης παρʼ ἐμὲ καὶ φιλοφρονούμενος εἶπες εὖ τι ῥῆμα ἔχον, ὡς ἔμοιγε ἐδόκεις καὶ

Plato to Dionysius, Tyrant of Syracuse, wishes well-doing. Let this greeting not only commence my letter but serve at the same time as a token that it is from me. Once when you were feasting the Locrian youths and were seated at a distance from me, you got up and came over to me and in a friendly spirit made some remark