Scicli was founded by the Sicels (whence probably the name) around 300 BCE. In 864 CE, Scicli was conquered by the Arabs, as part of the Muslim conquest of Sicily. Under their rule it flourished as an agricultural and trade center.
In 1091, it was conquered from the Arabs by the Normans, under Roger I of Hauteville, after a fierce battle. Following the various dynasties ruling the Kingdom of Sicily, it was an Aragonese-Spanish possession before being united in the Kingdom of Italy in the mid 19th century.
Following a catastrophic earthquake in 1693, much of the town was rebuilt in the Sicilian baroque style, which today gives the town the elegant appearance which draws many tourists to visit it. Alongside seven other cities in the Val di Noto, it has been listed as one of UNESCO's World Heritage Site in the list of Late Baroque Towns of the Val di Noto.
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.