The Thirty Tyrants (Ancient Greek: οἱ τριάκοντα τύραννοι, hoi triákonta týrannoi) were a pro-Spartan oligarchy installed in Athens after its defeat in the Peloponnesian War in 404 BCE. Upon Lysander's request, the Thirty were elected as a tyrannical government, not just as a legislative committee. The Thirty Tyrants maintained power for eight months. Although brief, their reign resulted in the killing of 5% of the Athenian population, the confiscation of citizens' property, and the exile of other democratic supporters. They became known as the "Thirty Tyrants" because of their cruel and oppressive tactics. The two leading members were Critias and Theramenes.