The Abbey of Saint-Evroul is a former Benedictine abbey, today in ruins. Its name refers to its founder, Ebrulf (Evroul), who founded a hermitage in the forest of Ouche around 560. The abbey was rebuilt around 1000. Robert de Grantmesnil served as abbot of Saint-Evroul, which he helped restore in 1050. He had become a monk at Saint-Evroul before becoming its abbot. Orderic Vitalis entered the abbey as a young boy and later wrote a history of the abbey. Saint-Evroul was famed for its musical programme and eleven monks brought its musical traditions to the abbey of Sant'Eufemia (now part ot town of Lamezia Terme) in Calabria. The abbey was rebuilt again between 1231 and 1284. In 1628 it was closed and demolished finally in the early 1800s.
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.