=227.= The Spartan hatred of Thebes was not allayed by the return of peace. To annoy the latter city, Platæa[56] was rebuilt, and as many as possible of its former citizens brought back. An expedition against Olynthus gave occasion for a more decided act of hostility. Phœ´bidas, on his march through Bœotia, happened to approach Thebes on a festal day, when the citadel was occupied only by women. Aided by some citizens who were in secret alliance with Sparta, he seized the Cadmea, had the chief of the patriotic party put to death on a false charge, and effected a revolution in the government which made Thebes only a subservient ally of Sparta. The Lacedæmonians pretended to join in the general indignation of Greece at this outrage; but though they dismissed Phœbidas, they kept the Cadmea. [Sidenote: B. C. 382.] =228.= OLYNTHIAN WAR. The war in Macedonia was now prosecuted with the aid of Thebes. Olynthus, in the Chalcidian peninsula, had become the head of a powerful confederacy of Grecian cities; but Acan´thus and Apollo´nia refused to join it, and applied to Sparta for help. Amyn´tas, king of Macedonia, took their part, and joined his troops with those of Eudamidas. Olynthus, by means of its excellent cavalry, held out bravely for four years; but at last it fell, and the league was dissolved. The Macedonian ports returned into subjection to Amyntas, while the Greek cities joined the Spartan alliance. Sparta was now leagued on all sides with the enemies of Greece: with the Persians, with Dionysius of Syracuse, and with Macedon. By the destruction of the Olynthian League, she had removed the chief obstacle to the Macedonian power, which was soon to overthrow the freedom of the Greeks. [Sidenote: B. C. 379.] =229.= Thebes remained three years in the control of the Lacedæmonian party. But the citizens were discontented, and a company of exiles at Athens were awaiting an opportunity of vengeance. Among them was Pelop´idas, a noble and wealthy youth, who had already distinguished himself by his patriotism. He was the ardent friend of Epam´inon´das, a Theban of greater age and still more exalted virtue than himself. A plan was now formed among the exiles for the deliverance of Thebes. Pelopidas was its leader; but Epaminondas at first held back, because the execution of the plot required deceit, and the possible shedding of innocent blood. He was a strict Pythagorean; and so pure were his principles, that he was never known to trifle with the truth even in jest, or to sacrifice it for any interest.