Passage 8.5.5
Αἰπύτῳ δὲ τῷ Ἱππόθου παρελθεῖν ἐς τὸ ἱερὸν τοῦ Ποσειδῶνος τὸ ἐν Μαντινείᾳ τολμήσαντι--- ἔσοδος δὲ ἀνθρώποις οὔτε τότε ἐς αὐτὸ ἦν οὔτε ἄχρι ἡμῶν ἔστιν---, ἐς τοῦτο ἐσελθόντι τυφλωθῆναι καὶ οὐ μετὰ πολὺ τῆς συμφορᾶς τελευτῆσαί οἱ τὸν βίον ἐγένετο.
When Aepytus, son of Hippothous, dared to enter the sanctuary of Poseidon in Mantineia—into which it was forbidden for people to enter, neither then nor at any time up until our own day—he was struck blind upon entering, and not long after this misfortune, his life came to an end.