Theseus // (Ancient Greek: Θησεύς Greek: [tʰɛːsěu̯s]) was the mythical founder-king of Athens, son of Aegeus and Poseidon, both of whom Aethra had slept with in one night. Theseus was a founder-hero, like Perseus, Cadmus, or Heracles, all of whom battled and overcame foes that were identified with an archaic religious and social order. As Heracles was the Dorian hero, Theseus was the Athenian founding hero, considered by them as their own great reformer: his name comes from the same root as θεσμός ("thesmos"), Greek for "institution". He was responsible for the synoikismos ("dwelling together")—the political unification of Attica under Athens, represented emblematically in his journey of labours, subduing highly localized ogres and monstrous beasts. Because he was the unifying king, Theseus built and occupied a palace on the fortress of the Acropolis that may have been similar to the palace that was excavated in Mycenae. Pausanias reports that after the synoikismos, Theseus established a cult of Aphrodite Pandemos ("Aphrodite of all the People") and Peitho on the southern slope of the Acropolis.