Themistocles
Rebuilding of Athens after the Persian invasion

Whatever the cause of Themistocles's unpopularity in 479 BC, it obviously did not last long. Both Diodorus and Plutarch suggest he was quickly restored to the favour of the Athenians. Indeed, after 479 BC, he seems to have enjoyed a relatively long period of popularity.

In the aftermath of the invasion and the Destruction of Athens by the Achaemenids, the Athenians began rebuilding their city under the guidance of Themistocles in the autumn of 479 BC. They wished to restore the fortifications of Athens, but the Spartans objected on the grounds that no place north of the Isthmus should be left that the Persians could use as a fortress. Themistocles urged the citizens to build the fortifications as quickly as possible, then went to Sparta as an ambassador to answer the charges levelled by the Spartans. There, he assured them that no building work was on-going, and urged them to send emissaries to Athens to see for themselves. By the time the ambassadors arrived, the Athenians had finished building, and then detained the Spartan ambassadors when they complained about the presence of the fortifications. By delaying in this manner, Themistocles gave the Athenians enough time to fortify the city, and thus ward off any Spartan attack aimed at preventing the re-fortification of Athens. Furthermore, the Spartans were obliged to repatriate Themistocles in order to free their own ambassadors. However, this episode may be seen as the beginning of the Spartan mistrust of Themistocles, which would return to haunt him.

Themistocles also now returned to his naval policy, and more ambitious undertakings that would increase the dominant position of his native state. He further extended and fortified the port complex at Piraeus, and "fastened the city to the Piraeus, and the land to the sea". Themistocles probably aimed to make Athens the dominant naval power in the Aegean. Indeed, Athens would create the Delian League in 478 BC, uniting the naval power of the Aegean Islands and Ionia under Athenian leadership. Themistocles introduced tax breaks for merchants and artisans, to attract both people and trade to the city to make Athens a great mercantile centre. He also instructed the Athenians to build 20 triremes per year, to ensure that their dominance in naval matters continued. Plutarch reports that Themistocles also secretly proposed to destroy the beached ships of the other Allied navies to ensure complete naval dominance—but was overruled by Aristides and the council of Athens.
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