Passage 5.26.7
πρὸς δὲ τοῖς ἐλάσσοσιν ἀναθήμασι τοῦ Μικύθου, ποιηθεῖσι δὲ ὑπὸ Διονυσίου, πρὸς τούτοις Ἡρακλέους ἐστὶ τῶν ἔργων τὸ ἐς τὸν λέοντα τὸν ἐν Νεμέᾳ καὶ ὕδραν τε καὶ ἐς τὸν κύνα τοῦ Ἅιδου καὶ τὸν ἐπὶ Ἐρυμάνθῳ ποταμῷ κάπρον· ἐκόμισαν δὲ αὐτὰ ἐς Ὀλυμπίαν Ἡρακλεῶται Μαριανδυνῶν ὁμόρων βαρβάρων καταδραμόντες τὴν χώραν. ἡ δὲ Ἡράκλεια πεπόλισται μὲν ἐπὶ Εὐξείνῳ πόντῳ, ἀπῳκίσθη δὲ ἐκ Μεγάρων· μετέσχον δὲ καὶ Βοιωτῶν Ταναγραῖοι τοῦ οἰκισμοῦ.
Near the smaller offerings dedicated by Mikythos, which were made by Dionysios, are representations of Herakles' labors: against the lion in Nemea, the Hydra, the dog of Hades, and the boar at the River Erymanthos. These were carried off to Olympia by the Herakleots after they had ravaged the land of the neighboring barbarian tribe of the Mariandynoi. Herakleia itself is a city established on the Euxine Sea, colonized originally from Megara, with the Tanagraians of Boeotia taking part in the founding expedition.