Pausanias, Description of Greece 1.21.1
From Pausanias’ guidebook to Greece.
εἰσὶ δὲ Ἀθηναίοις εἰκόνες ἐν τῷ θεάτρῳ καὶ τραγῳδίας καὶ κωμῳδίας ποιητῶν, αἱ πολλαὶ τῶν ἀφανεστέρων· ὅτι μὴ γὰρ Μένανδρος, οὐδεὶς ἦν ποιητὴς κωμῳδίας τῶν ἐς δόξαν ἡκόντων. τραγῳδίας δὲ κεῖνται τῶν φανερῶν Εὐριπίδης καὶ Σοφοκλῆς. λέγεται δὲ Σοφοκλέους τελευτήσαντος ἐσβαλεῖν ἐς τὴν Ἀττικὴν Λακεδαιμονίους, καὶ σφῶν τὸν ἡγούμενον ἰδεῖν ἐπιστάντα οἱ Διόνυσον κελεύειν τιμαῖς, ὅσαι καθεστήκασιν ἐπὶ τοῖς τεθνεῶσι, τὴν Σειρῆνα τὴν νέαν τιμᾶν· καί οἱ τὸ ὄναρ <ἐς> Σοφοκλέα καὶ τὴν Σοφοκλέους ποίησιν ἐφαίνετο ἔχειν, εἰώθασι δὲ καὶ νῦν ἔτι ποιημάτων καὶ λόγων τὸ ἐπαγωγὸν Σειρῆνι εἰκάζειν.
In the theatre the Athenians have statues of both tragic and comic poets, mostly of the less famous ones. For apart from Menander, there is not one comic poet from those who have won fame. But of those famous for tragedy there are Euripides and Sophocles. A story is told that after Sophocles’ death the Lacedamonians invaded Attica and their commander saw Dionysus standing over him and telling him to honour the new Siren with honours such as were appointed for the dead. He thought that the dream was about Sophocles and the poetry of Sophocles, and even today people are accustomed to liken to a Siren whatever is attractive in poems and in words.