Agilkia Island in the reservoir of the Old Aswan Dam along the Nile River is the present site of the relocated ancient Egyptian temple complex of Philae. Partially to completely flooded by the old dam's construction in 1902, the Philae complex was dismantled and relocated to Agilkia island, as part of a wider UNESCO project related to the 1960s construction of the Aswan High Dam and the eventual flooding of many sites posed by its large reservoir upstream. To allow Agilkia island to accominate the relocated temple, the island was leveled to match the old contours of Philae island as best as possible, which required the removal of the top of the island.
The most ancient was a temple for Isis, built in the reign of Nectanebo I during 380–362 BC, which was approached from the river through a double colonnade. Nekhtnebef was his ancient Egyptian royal titulary and he became the founding pharaoh of the Thirtieth and last native dynasty when he deposed and killed Nepherites II.
For the most part, the other ruins date from the Ptolemaic Kingdom, more especially with the reigns of Ptolemy II Philadelphus, Ptolemy V Epiphanes, and Ptolemy VI Philometor (282–145 BC), with many traces of Roman work in Philae dedicated to Ammon-Osiris.
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.