Pelopponesian War Timeline By ataima28 550 BCE Peloponnesian League Formed 476 BCE Delian League Formed 476 BCE Second Persian War 467 BCE Victory of Eurymedon River 462 BCE Cimon Tries Helping Sparta with Helot Revolt 454 BCE Athens moves Delian Treasury to Athens 435 BCE The Three Inciting Incidents 431 BCE Spartans invade Attica 431 BCE Peloponnesian War Began 430 BCE Pericles’ Speech and the Plague of Athens 425 BCE Pylos and Sphacteria 421 BCE Peace of Nicias 420 BCE Alcibiades Elected 418 BCE Battle at Mantinea 416 BCE Melian Dialogue 415 BCE Sicilian Expedition 412 BCE Sparta Allies with Persia 406 BCE Battle of Arginusae 405 BCE Battle of Aegospotami 404 BCE Athens Surrenders to Lysander at Piraeus 403 BCE Oligarchic Revolution 377 BCE Second Athenian League 371 BCE Thebes Becomes More Powerful 359 BCE Philip II becomes king of Macedonia Period: 356 BCE to 341 BCE Conquest of Thrace 338 BCE Philip II of Macedon Wins Battle of Chaeronea 336 BCE Sparts Declares War on Persian King