The Temple of Hephaestus or Hephaisteion (also Hephesteum; Ancient Greek: Ἡφαιστεῖον, Modern Greek: Ναός Ηφαίστου) or earlier as the Theseion (also Theseum; Ancient Greek: Θησεῖον, Modern Greek: Θησείο), is a well-preserved Greek temple; it remains standing largely as built. It is a Doric peripteral temple, and is located at the north-west side of the Agora of Athens, on top of the Agoraios Kolonos hill. From the 7th century until 1834, it served as the Greek Orthodox church of St.