XIX. Immediately after the great war, he began to rebuild and fortify the city. In order to succeed in this, Theopompus says that he bribed the Spartan ephors into laying aside opposition, but most writers say that he outwitted them by proceeding to Sparta nominally on an embassy. Then when the Spartans complained to him that Athens was being fortified, and when Poliarchus came expressly from Aegina to charge him with it, he denied it, and bade them send commissioners to Athens to see whether it was true, wishing both to obtain time for the fortifications to be built, and also to place these commissioners in the hands of the Athenians, as hostages for his own safety. His expectations were realised; for the Lacedaemonians, on discovering the truth, did him no harm, but dissembled their anger and sent him away. After this he built Peiraeus, as he perceived the excellence of its harbours, and was desirous to turn the whole attention of the Athenians to naval pursuits. In this he pursued a policy exactly the opposite to that of the ancient kings of Attica; for they are said to have endeavoured to keep their subjects away from the sea, and to accustom them to till the ground instead of going on board ships, quoting the legend that Athene and Poseidon had a contest for the possession of the land, and that she gained a decision in her favour by the production of the sacred olive. Themistokles, on the other hand, did not so much "stick Peiraeus on to Athens," as Aristophanes the comic poet said, as make the city dependent upon Peiraeus, and the land dependent on the sea. By this means he transferred power from the nobles to the people, because sailors and pilots became the real strength of the State. For this reason the thirty tyrants destroyed the bema, or tribune on the place of public assembly, which was built looking towards the sea, and built another which looked inland, because they thought that the naval supremacy of Athens had been the origin of its democratic constitution, and that an oligarchy had less to fear from men who cultivated the land. XX. Themistokles had even more extended views than these about making the Athenians supreme at sea. When Xerxes was gone, the whole Greek fleet was drawn up on shore for the winter at Pagasae. Themistokles then publicly told the Athenians that he had a plan which would save and benefit them all, but which must not be divulged. The Athenians bade him tell Aristeides only, and to execute his designs if he approved.