Ensdorf Abbey was a house of the Benedictine Order, dedicated to Saint James. It was founded in 1121 by Pfalzgraf Otto of Wittelsbach. The monastery was dissolved in 1556 but restored in 1669, only to be dissolved again in 1802 in the secularisation of the period. The premises were taken over in 1920 by the Salesians of Don Bosco, who still occupy them.
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.