Passage 8.25.11
ὁ δὲ Λάδων τῆς Ἐρινύος τὸ ἱερὸν ἀπολιπὼν ἐν ἀριστερᾷ, παρέξεισιν ἐν ἀριστερᾷ μὲν τοῦ Ἀπόλλωνος τοῦ Ὀγκαιάτου τὸν ναόν, τὰ δὲ ἐν δεξιᾷ παρὰ Ἀσκληπιοῦ Παιδὸς ἱερόν, ἔνθα Τρυγόνος μνῆμά ἐστι τροφοῦ · τροφὸν δὲ Ἀσκληπιοῦ τὴν Τρυγόνα εἶναι λέγουσιν· ἐν γὰρ τῇ Θελπούσῃ τῷ Ἀσκληπιῷ παιδὶ ἐκκειμένῳ φασὶν ἐπιτυχόντα Αὐτόλαον Ἀρκάδος υἱὸν νόθον ἀνελέσθαι τὸ παιδίον, καὶ ἐπὶ τούτῳ παῖδα Ἀσκληπιὸν εἰκότα εἶναι μᾶλλον ἡγούμην, ὃ καὶ ἐδήλωσα ἐν τοῖς Ἐπιδαυρίων.
The Ladon, after leaving the sanctuary of Erinys on the left, next passes on the left the temple of Apollo Ongaeates, and on the right a sanctuary of Asclepius Païs, where lies the tomb of Trygone, his nurse. They say that Trygone was nurse to Asclepius. For when the child Asclepius had been exposed at Thelpusa, Autolaus, an illegitimate son of Arcas, chanced upon him, picked up the infant, and thereupon I considered it more likely that Asclepius was indeed a child, a matter I have already explained in my discussion of the Epidaurians.