The church of St. George was part of the Bernardine Monastery. The first wooden church was built in 1468. It was replaced by the current brick church in the late 15th century and completed before 1503. It’s been ruined by fire three times, suffered the wrath of the Moscow army during the war of 1656-1659 and then had a bit of a rest during the 18th century before Napoleon turned it into a warehouse.
During Soviet times, the church was used to store medicine. It was returned to the Friars in 1993 in a pretty shabby condition, and restoration of its outstanding if run-down Gothic, Renaissance and Baroque interior has been slow to say the least. Ongoing restoration work has seen the addition of a new roof although the church itself remains locked for the foreseeable future.
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.