 Lysander then put in place a puppet government in Athens with the establishment of the oligarchy of the Thirty Tyrants under Critias which included Theramenes as a leading member.However, in 403 BC Pausanias was able to undermine Lysander's dominance of Athens after Pausanias gained the command of the Peloponnesian League expedition against the Athenian democrats then based in Piraeus.Despite opposition from Lysander, Pausanias took the opportunity to promote a reconciliation between the democratic party in Piraeus and the oligarchs controlling Athens' main city, thus allowing the re-establishment of democratic government in Athens.