Thrasybulus (thrăs´əbyōō´ləs), d. c.389 BC, Athenian statesman. A strong supporter of the democratic and anti-Spartan party, he successfully opposed (411 BC) the oligarchical Four Hundred and later had Alcibiades recalled. In the Peloponnesian War he fought at Cyzicus (410; now in Turkey) and Arginusae (406). Banished by the Thirty Tyrants, he obtained the help of exiles in Thebes, marched with his force from Phyle to Piraeus, and overthrew (403) the Thirty. He was leading a campaign in a new war against Sparta when the excesses of his troops so outraged the citizens of Aspendus (now in Turkey) that they murdered him.