Thrasybulus (Greek: Θρασύβουλος, Thrasýboulos) was an Athenian statesman and military from the 2nd half of the 5th century BC, known for his democratic conviction.
As a naval guardian in 411 he did, along with his friend Thrasyllus, that the crew of his fleet at Samos did not recognize the legality of the oligarchic revolution. In the same year, he defeated the Spartan fleet at Cynossema with Thrasyllus. At the end of the Peloponnese War, he was banned by the Thirty Tirans in 404 and fled to Thebe where he organized the democratic resistance. When his followers were numerous enough a few months later, he conquered as the head of the subjugated democratic party with Anytus, the Thirty militia and occupied the port of Piraeus. He also did the departure of the Spartan garrison and he restored democracy in Athens. He then played an important role in the so-called Corinthian War, and in 389/388 led an Athenian fleet, which, however, failed to utilize its successes in the absence of financial support. During a robbery of his armed forces in Aspendus, Thrasyllus was killed in his tent by the locals.
At a time when Athens lived too far beyond his resources to keep Pericles political ambitions, Thrasybulus remained obstinate in the imperialist politics of his city. He became known as a loyal supporter of democracy who tried to transcend the excesses of the party mistake in his time.
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