The Oratory of San Marco is a Byzantine-style oratory situated in the old town centre of Rossano, a frazione of Corigliano-Rossano.
The church was built in the 10th century by St. Nilus the Younger as a place of retirement for nearby eremite monks and is one of the most important testimonies to Byzantine art in Italy. It is the most ancient monument in the city and was originally dedicated to St. Anastasia. It has a Greek cross plan with five characteristic domes on cylindrical drums and, in the past, the entire building was supported by very thin columns then these were covered with cement after restoration works. Between 1928 and 1934, during the restoration works, a fragment of a fresco picturing a Virgin Hodegetria was discovered.
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.