Passage 6.22.2
οἰκιστὴν μὲν δὴ γενέσθαι τῇ πόλει Πίσον τὸν Περιήρους φασὶ τοῦ Αἰόλου· Πισαῖοι δὲ ἐφειλκύσαντο αὐθαίρετον συμφορὰν ἀπεχθανόμενοί τε Ἠλείοις καὶ σπουδὴν ποιούμενοι τιθέναι τὸν Ὀλυμπικὸν ἀγῶνα ἀντὶ Ἠλείων, οἵγε Ὀλυμπιάδι μὲν τῇ ὀγδόῃ τὸν Ἀργεῖον ἐπηγάγοντο Φείδωνα τυράννων τῶν ἐν Ἕλλησι μάλιστα ὑβρίσαντα καὶ τὸν ἀγῶνα ἔθεσαν ὁμοῦ τῷ Φείδωνι, τετάρτῃ δὲ Ὀλυμπιάδι καὶ τριακοστῇ στρατὸν οἱ Πισαῖοι καὶ βασιλεὺς αὐτῶν Πανταλέων ὁ Ὀμφαλίωνος παρὰ τῶν προσχώρων ἀθροίσαντες ἐποίησαν ἀντὶ Ἠλείων τὰ Ὀλύμπια.
They say the founder of the city was Pisus, son of Perieres and descendant of Aeolus. But the Pisatans brought misfortune upon themselves by willingly provoking the Eleans and eagerly attempting to celebrate the Olympic festival in their place. In the eighth Olympiad, indeed, they brought in the Argive Pheidon, who was renowned for his arrogance above all Greek tyrants, and with him organized the games; later, in the thirty-fourth Olympiad, the Pisatans and their king Pantaleon, son of Omphalion, collected an army from their neighbors and once more held the Olympic festival instead of the Eleans.