These were the most powerful navies. And even these, although so many generations had elapsed since the Trojan war, seem to have been principally composed of the old fifty-oars and long-boats, and to have counted few galleys among their ranks. Indeed it was only shortly before the Persian war and the death of Darius the successor of Cambyses, that the Sicilian tyrants and the Corcyraeans acquired any large number of galleys. For after these there were no navies of any account in Hellas till the expedition of Xerxes; Aegina, Athens, and others may have possessed a few vessels, but they were principally fifty-oars. It was quite at the end of this period that the war with Aegina and the prospect of the barbarian invasion enabled Themistocles to persuade the Athenians to build the fleet with which they fought at Salamis; and even these vessels had not complete decks.