Thrasybulus (ˌθræsᵻˈbjuːləs; Θρασύβουλος ; 440 – 388 BC) was an Athenian general and democratic leader. In 411 BC, in the wake of an oligarchic coup at Athens, the pro-democracy sailors at Samos elected him as a general, making him a primary leader of the ultimately successful democratic resistance to the coup. As general, he was responsible for recalling the controversial nobleman Alcibiades from exile, and the two worked together extensively over the next several years. In 411 and 410, Thrasybulus was in command along with Alcibiades and others at several critical Athenian naval victories.
After Athens' defeat in the Peloponnesian War, Thrasybulus led the democratic resistance to the new oligarchic government, known as the Thirty Tyrants, imposed by the victorious Spartans upon Athens. In 404 BC, he commanded a small force of exiles that invaded the Spartan-ruled Attica and, in successive battles, first defeated a Spartan garrison and then the forces of the oligarchy. In the wake of these victories, democracy was re-established at Athens. As a leader of this revived democracy in the 4th century BC, Thrasybulus advocated a policy of resistance to Sparta and sought to restore Athens' imperial power. He was killed in 388 BC while leading an Athenian naval force during the Corinthian War.
Almost nothing is known of Thrasybulus's background or early life. His father was named Lycus, and he was a native of the deme of Steiria in Athens. He was probably born between 455 and 441 BC, although dates as late as the later 430s BC have been suggested. He was married, and had two children. Several facts make it clear that he was from a wealthy family; he held the office of trierarch, which involved significant personal expenditures on several occasions, and in the 4th century BC his son was able to pay a substantial fine of 10 talents.
By 411 Thrasybulus had established a reputation as a pro-democracy politician. Throughout his career, Thrasybulus consistently advocated several policies.