375. Pellene was the first Achaean city to join the League in 431 (it acted independently several times from its federal structure, the Achaean League). The city was conquered by Epaminondas in 367 and allied with Thebes. The Achaean League apparently followed Pellene and joined as a single unit by 429. In 417 Sparta forced the Achaeans to adopt an oligarchic constitution. The Achaeans were conquered by Epaminondas in 366. By 389, the Achaeans controlled Pleuron, Kalydon and Naupaktos on the northern shore of the Corinthian Gulf, which they lost in 366. Athens was forced to join the League in 404 following its defeat in the Peloponnesian War. Athens left the League in 395 with the Corinthian War. Eleusis became independent from Athens in 403, as a refuge of the Thirty Tyrants, and joined the League until it was recovered by Athens in 401. The Akrorians were freed from Elis c.400; they formed a federal state and joined the League, probably as a single unit. The Triphylians were freed from Elis c.400; they formed a federal state and joined the League, probably as a single unit. Olynthus and the Chalkidians joined the League after its defeat against Sparta in 378. List of wars of the Peloponnesian League War against Polycrates: c.525, Corinth and exiled Samians encouraged Sparta to launch an attack against Polycrates, tyrant of Samos. The expedition was a failure. War against Hippias: c.511, Sparta sent a first naval army against Athens, at the time ruled by the tyrant Hippias, perhaps because of his pro-Persian policies, or a Delphic order. The marines disembarked by Anchimolus were defeated by Hippias' Thessalian allies. The following year, Cleomenes I came back with a larger force through land; he took the Acropolis and forced Hippias to go into exile in the Persian Empire. First Peloponnesian War Second Peloponnesian War Corinthian War First Olynthian War: In summer 382, the Peloponnesian League attacked the Chalkidian league, dominated by Olynthus. Officially, Sparta answered the call from the cities of Akanthos and Apollonia against Olynthus, but they actually helped the Macedonian king Amyntas who had been dethroned by Olynthus, which also threatened Spartan hegemony in northern Greece. The war was difficult, but in 379 Olynthus surrendered; the federation disbanded and its members were forced to join the Peloponnesian League. Boeotian War References Bibliography Hans Beck & Peter Funke (editors), Federalism in Greek antiquity, Cambridge University Press, 2015.