The Parish and Priory Church of St. Mary was founded around 1072 as a Benedictine priory by William FitzOsbern and his son Roger de Breteuil. By the early 12th century, the monastic establishment had the status of an alien priory in its own right, though it probably never held more than about 12 monks. It superseded an earlier Augustinian priory located about 2 km away.
As Chepstow developed as a market town and port around the castle and priory during the medieval period, the nave became used as the parish church. Accommodation was built on the south side of the church, in the 13th century. The priory had extensive grounds, probably including most of the land south of the church enclosed by Chepstow's 13th-century town wall or Port Wall. The priory was eventually suppressed during the Dissolution of the Monasteries in 1536 during the English Reformation, at which time there were still three monks in residence. Most of the priory buildings, including the choir part of the church, the cloister, chapter house, lodgings and kitchens, were demolished at that time, and the foundations are buried beneath a car park beside the current church. Remains of a large barn and well were also found during excavations in the 1970s.
Part of the Norman church remains, but it has been greatly modified over later centuries. The original Priory Church was built in local yellow Triassic sandstone, with a long vaulted nave, massive piers, and a notably ornamented west entrance doorway with zigzag and lozenge patterns, dating from the early 12th century.
The main central tower of the original church collapsed in a storm in 1701, destroying the transepts. A new wall was then built at the eastern end of the nave, and its western end built up to form a new tower.
The church contains two fonts, one of Norman origin and the other from the 15th century. There are several notable tombs and memorials, including that of Henry Somerset, 2nd Earl of Worcester, and the Jacobean tomb of local benefactor Margaret Cleyton with her two husbands and 12 children.
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.