The oldest parts of Rö church dates from the late 1200s. Somethimes around 1475 brick arches were added to the roof. The church was badly damaged by fire in late 1500s or early 1600s. The most interesting detail is a Madonna sculpture made probably in England around the year 1200. The font originates also from the same ages and other sculptures and cruficix from 1400s.
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.