Passage 6.3.3
εἶναι δὲ αὐτὸν ἐκ Σικυῶνος οἱ Ἠλεῖοί φασι καὶ ἄρχειν Σικυωνίων, στρατεῦσαι δὲ ἐπὶ Σικυῶνα αὐτοὶ φιλίᾳ Θηβαίων ὁμοῦ τῇ ἐκ Βοιωτίας δυνάμει. φαίνοιτο ἂν οὖν ἡ ἐπὶ Σικυῶνα Ἠλείων καὶ Θηβαίων στρατεία γεγενῆσθαι μετὰ τὸ ἀτύχημα Λακεδαιμονίων τὸ ἐν Λεύκτροις.
The Eleans say that he was from Sicyon and ruled over the Sicyonians, and that they themselves, in alliance with the Thebans, undertook a campaign against Sicyon, together with the forces from Boeotia. Thus it would seem that the expedition of the Eleans and Thebans against Sicyon took place after the disaster suffered by the Lacedaemonians at Leuctra.