Abbey Sainte-Marie du Rivet may be founded in the late 8th century. There are some remains of the 9th century fortifications and the abbey church was built in the 13th century. The community is affiliated to the Cistercian order in 1189: at this date, the monastery already bears the name of Sainte-Marie.
The abbey was ravaged during the French Wars of Religion and in 1702 there was only one monk left. In 1938 the abbey came back to life, with a community of nuns. Today, 14 nuns live in the Rivet Abbey. They are Trappistines, that is to say they belong to the Cistercian order of Strict Observance, which is an order stemming from the Cistercians of the Common Observance, themselves from the Benedictines.
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.