|Summary:||Peripteral temple; on the west side of the Agora, on the Kolonos Agoraios.|
|Date:||ca. 449 BC - 444 BC|
13.71 m x 38.24 m; intercolumniations: external columns 2.58 m (at the corners 2.41 m); lower diameter external columns: 1.02 m (at the corners 1.04 m); height external columns: 5.71 m.
Doric peripteral temple, 6 x 13 columns. Cella with a pronaos and an opisthodomos, both distyle in antis. Interior with superimposed Doric colonnade along 3 of the cella walls, but the original number of columns is uncertain.
Usually referred to as the Hephaisteion, the building was previously called the Theseion, a name still in common use. It has also been proposed that the temple was dedicated to Eukleia (Artemis). The temple was richly decorated. Planting pits dating from the 3rd century B.C. show that the temple grounds were fully landscaped. In the 7th century A.D. it was converted to a Christian church.