Château Saint-Léon is a former castle in the center of Eguisheim. The castle was built by the Counts of Eguisheim and taken over by the Bishop of Strasbourg during the 13th century. An episcopal bailiff occupied it until the French Revolution (1789). The enceinte was surrounded by a moat which was filled in by the 18th century. Houses built in the castle courtyard and against its walls were destroyed by a fire in 1877 which also damaged the castle - it was left in runs for many years.
In 1885, it was bought by the Bishop of Strasbourg through the mediation of a M. Stumpf who wanted to build a chapel dedicated to Saint Leo. The remains of the keep were destroyed and the chapel built in its place, the works being carried out by the architect of historic monuments, Charles Winkler. The chapel was completed in 1895. Winkler also restored the residence at the south of the site which had been rebuilt, with mullioned windows in the 16th century. He added a staircase turret and a neo-Renaissance balcony.
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.