The Arch of Hadrian is a monumental gateway resembling a Roman triumphal arch. It spanned an ancient road from the center of Athens, Greece, to the complex of structures on the eastern side of the city that included the Temple of Olympian Zeus. It has been proposed that the arch was built to celebrate the adventus (arrival) of the Roman Emperor Hadrian and to honor him for his many benefactions to the city, on the occasion of the dedication of the nearby temple complex in 131 or 132 AD. It is not certain who commissioned the arch, although it is probable that the citizens of Athens or another Greek group were responsible for its construction and design. There were two inscriptions on the arch, facing in opposite directions, naming both Theseus and Hadrian as founders of Athens. While it is clear that the inscriptions honor Hadrian, it is uncertain whether they refer to the city as a whole or to the city in two parts: one old and one new. The early idea, however, that the arch marked the line of the ancient city wall, and thus the division between the old and the new regions of the city, has been shown to be false by further excavation. The arch is located 325m southeast of the Acropolis.
The entire monument is made of Pentelic marble, from Mt. Pentelikon, 18.2km northeast of the arch. Pentelic marble was used for the Parthenon and many other notable structures in Athens, although its quality can vary significantly. The marble used for the arch is of a lower grade that had more inclusions than that used in the best Athenian buildings. The arch was constructed without cement or mortar from solid marble, using clamps to connect the cut stones. It is 18m high, 13.5m wide, and 2.3m in depth. Its design is fully symmetrical from front to back and side to side.
The single arched passageway of the lower level is 6.5m wide and was supported by pilasters crowned with Corinthian capitals. Similar, but taller, pilasters flank the outer corners of the lower level. The space between the outer pilasters and the arched opening was filled in with squared stones with drafted edges to emphasize the design. On either side of the central passageway was a Corinthian column on a rectangular, raised base projecting from the center of the wall. The lower level was crowned with an Ionic architrave capped with dentils and a projecting geison.
The central projecting pediment of the upper level.The upper level of the arch was composed of a series of Corinthian columns and pilasters dividing the space into three rectangular openings. Each of the outer openings was crowned with an Ionic architrave capped with dentils and a projecting geison, in the manner of the lower level. The central opening, however, was flanked by antae with engaged Corinthian half-columns that supported a projecting triangular pediment, which rested above the dentils, geison, and sima that joined to those of the two wings. At the peak of the pediment, there was a small vegetal acroterion. The central opening of the upper level was originally closed off by a thin screen of stone, c. 7cm thick. Only the slots for its mounting are now preserved. The design of this central aediculum-like, niche of the upper level is similar to the architecture of the scaenae frons and highly evocative of the representations of aedicula in wall painting of the 2nd Pompeian style.
Restoration Drawing of the SE side of the Arch (Stuart and Revett).Even a casual examination of this arch, with a few of the many preserved Roman triumphal arches in mind, reveals the significant design variation between the two structures. The number of arched passageways of the lower level of Roman triumphal arches was variable as was the presence of a secondary passageway along the long axis of the structure; as a diplyon arch with a single passageway, the lower level of the Arch of Hadrian falls within the gamut of the architectural genre. Roman triumphal arches, however, typically have a massive, solid attic (upper level), often filled with a dedicatory inscription and sculptural decoration. In addition, Roman arches typically supported major stone or bronze statuary, often including a quadriga (four-horse chariot) or similar at top center. As Willers notes, the design of the Arch of Hadrian has a very refined upper level that does not allow the mounting of major decoration on top of the attic.
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