Netum was a considerable ancient town in the south of Sicily. Its current site is at the località of Noto Antica, in the modern comune of Noto.
As a treaty was concluded in 263 BCE between the Romans and King Hieron II of Syracuse, Netum was noticed as one of the cities left in subjection to that monarch. Ptolemy is the last ancient writer that mentions the name; but there is no doubt that it continued to exist throughout the Middle Ages; and under the Norman kings rose to be a place of great importance, and the capital of the southern province of Sicily, to which it gave the name of Val di Noto. But having suffered repeatedly from earthquakes, the inhabitants were induced to emigrate to a site nearer the sea, where they founded the modern city of Noto, in 1703.
The old site is on the summit of a lofty hill about 14 km from the modern town and 20 km from the sea-coast: some remains of the ancient amphitheatre, and of a building called a gymnasium, are still visible, and a Greek inscription, which belongs to the time of Hieron II.
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.