Passage 2.29.5
χρόνῳ δὲ ὕστερον μοῖρα Ἀργείων τῶν Ἐπίδαυρον ὁμοῦ Δηιφόντῃ κατασχόντων, διαβᾶσα ἐς Αἴγιναν καὶ Αἰγινήταις τοῖς ἀρχαίοις γενόμενοι σύνοικοι, τὰ Δωριέων ἔθη καὶ φωνὴν κατεστήσαντο ἐν τῇ νήσῳ. προελθοῦσι δὲ Αἰγινήταις ἐς μέγα δυνάμεως, ὡς Ἀθηναίων γενέσθαι ναυσὶν ἐπικρατεστέρους καὶ ἐν τῷ Μηδικῷ πολέμῳ παρασχέσθαι πλοῖα μετά γε Ἀθηναίους πλεῖστα, οὐ παρέμεινεν ἐς ἅπαν ἡ εὐδαιμονία, γενόμενοι δὲ ὑπὸ Ἀθηναίων ἀνάστατοι Θυρέαν τὴν ἐν τῇ Ἀργολίδι Λακεδαιμονίων δόντων ᾤκησαν. καὶ ἀπέλαβον μὲν τὴν νῆσον, ὅτε περὶ Ἑλλήσποντον αἱ Ἀθηναίων τριήρεις ἐλήφθησαν, πλούτου δὲ ἢ δυνάμεως οὐκέτι ἐξεγένετο ἐς ἴσον προελθεῖν σφισιν.
Some time later, a part of the Argives who had occupied Epidaurus together with Deiphontes crossed over to Aegina, settled beside the original inhabitants, and established the customs and language of the Dorians upon the island. When eventually the Aeginetans became very powerful—so much so that they surpassed even the Athenians in naval strength and offered, next to Athens, the greatest number of ships during the Persian War—their prosperity did not last forever. Driven out by the Athenians and becoming exiles, they settled in Thyrea in the Argolid, a territory granted to them by the Lacedaemonians. Although they eventually regained their island, when the Athenian triremes were captured around the Hellespont, they never again rose to their former wealth and power.