Waulsort Abbey was a Benedictine monastery located at Waulsort, Wallonia, now in Hastière. The monastery was founded in 946 by Irish monks. Saint Maccallin and Saint Cathróe were the first two abbots. Saint Forannan (d. 980) was also subsequently abbot of Waulsort.
The abbey was dissolved during the French Revolution in 1793, when it was sacked. The surviving structures have been remodelled as a private house.
The former abbey is principally known as the owner, from the 10th to the 18th century, of the Lothair Crystal.
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.