Passage 6.11.4
ὅσα μὲν δὴ ἔργων τῶν Θεαγένους ἐς τὸν ἀγῶνα ἥκει τὸν Ὀλυμπικόν, προεδήλωσεν ὁ λόγος ἤδη μοι τὰ δοκιμώτατα ἐξ αὐτῶν, Εὔθυμόν τε ὡς κατεμαχέσατο τὸν πύκτην καὶ ὡς ὑπὸ Ἠλείων ἐπεβλήθη τῷ Θεαγένει ζημία. τότε μὲν δὴ τοῦ παγκρατίου τὴν νίκην ἀνὴρ ἐκ Μαντινείας Δρομεὺς ὄνομα πρῶτος ὧν ἴσμεν ἀκονιτὶ λέγεται λαβεῖν· τὴν δὲ Ὀλυμπιάδα τὴν ἐπὶ ταύτῃ παγκρατιάζων ὁ Θεαγένης ἐκράτει.
Regarding the many athletic exploits of Theagenes at the Olympian games, my account has already mentioned the most noteworthy among them, such as his victory over the boxer Euthymos and the penalty imposed on Theagenes by the Eleans. At that time, however, a man from Mantineia named Dromeus is said to have been the first athlete known to us who gained the victory in the pancratium without competition. In the next Olympiad after this, Theagenes himself prevailed in the pancratium.