Many architects have been suggested but, without firm evidence, one refers simply to
The Hephaisteion Master. The temple is built of marble from the nearby Mt.
Penteli, excepting the bottom step of the
krepis or platform. The architectural sculpture is in both Pentelic and
Parian marble. The dimensions of the temple are 13.71 m north to south and 31.78 m east to west, with six columns on the short east and west sides and thirteen columns along the longer north and south sides (with each of the four corner columns being counted twice). The building has a
pronaos, a
cella housing cult images at the centre of the structure, and an
opisthodomos. The alignment of the antae of the pronaos with the third flank columns of the
peristyle is a design element unique to the middle of the 5th century BC. There is also an inner Doric
colonnade with five columns on the north and south side and three across the end (with the corner columns counted twice). The decorative sculptures highlight the extent of mixture of the two styles in the construction of the temple. Both the pronaos and the opisthodomos are decorated with continuous Ionic
friezes instead of the more typical Doric
triglyphs, supplementing the sculptures at the pediments. In the pediments, the Birth of Athena (east) and the Return of Hephaistos to Olympos (west), and, as akroteria, the Nereids Thetis and Eurynome (west) accompanied by Nikai, the two ensembles are dated to ca. 430 and ca. 420–413 BC respectively. The frieze of the pronaos depicts a scene from the battle of Theseus with the
Pallantides in the presence of gods while the frieze of the opisthodomos shows the battle of
Centaurs and
Lapiths. Only 18 of the 68
metopes of the temple of Hephaestus were sculpted, concentrated especially on the east side of the temple; the rest were perhaps painted. The ten metopes on the east side depict the Labours of
Heracles. The four easternmost metopes on the long north and south sides depict the Labours of Theseus. According to
Pausanias, the temple housed bronze statues of Athena and Hephaestus. An inscription records payments between 421–415 BC for two bronze statues but it does not mention the sculptor. Tradition attributes the work to
Alcamenes. Pausanias described the temple in the 2nd century: Above the Kerameikos [in Athens] and the
portico called the King's Portico is a temple of Hephaistos. I was not surprised that by it stands a statue of Athena, because I knew the story about
Erichthonius [i.e. the first king of Athens, a son of Hephaistos and Athena, birthed by Gaia the Earth]. In the 3rd century BC a small garden of pomegranate, myrtle, and laurel trees and shrubs was planted around the temple. The sanctuary would have been closed during the
persecution of pagans in the late Roman Empire. == Cult and festivals ==