The ancient theatre of Elis is situated on the north of the agora, on an old fluvial terrace of the River Peneus, appropriately landscaped for the purpose. The theatre was built in the 4th century BC. Major damage, probably due to an earthquake during the Late Hellenistic period, led to the replacement of the west retaining wall with a new one. The theatre was also modified in Roman times.
The theatre boasts the somewhat rare feature of an earthen cavea. Only the access passageways to the upper cavea, the parodoi and a row of stone seats in the lower cavea were faced with stone. Six staircases, approximately one metre wide and paved with river pebbles, divided the cavea into seven cunei. Strong retaining walls supported the fill of the cavea, forming, together with the lateral compartments of the stage, the two parodoi of the theatre.The permanent stone stage building is one of the earliest in Greece. It also preserved one of the oldest proscenia (early 3rd c. BC), its façade once decorated with half-columns.
Large holes along the stylobate were used to set up the scenery. Behind the proscenium were the various spacious compartments of the stage, with the parascenia on either side. The originally circular orchestra was truncated by the construction of an elongated cistern from which rainwater was channelled through an older duct into the River Peneus.The traveller Pausanias, who visited Elis in the latter half of the 2nd c. AD, found the theatre abandoned. A century later the whole area was turned into a cemetery. This destruction, also visible in other parts of the ancient city, is connected to the invasion of the Heruli (267 AD).
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.