The Couvent des Jacobins was a monastery in Saint-Sever - Jacobin was the French term for the Dominican Order. Founded in 1280 thanks to the support of Eleanor of Castile, wife of Edward I of England, it was partly destroyed in 1569 by Huguenot troops under Gabriel, comte de Montgomery during the Wars of Religion.
It was partly rebuilt thanks to the support of père Antonin Cloche, a native of the town who became master-general of the order in 1686. Its cloister and south and west wings were restored in the Languedoc Romanesque style using pink brick and stone.
After the French Revolution it was re-used as a school, college, agricultural school, store, fire-station, municipal baths and finally a market. From the 1970s it has housed cultural aspects of the town, including the musée des Jacobins.
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.