From the 12th century the Monastery of Santa María la Real was the home of a Premonstratensian community. The architecture is in a transitional style between Romanesque and Gothic.
The monastery was closed in the 19th century as a result of the Ecclesiastical Confiscations of Mendizábal. The buildings fell into ruin and in 1871 various capitals (dated circa 1200) were removed to the National Archaeological Museum of Spain.
In 1914 the monastery was declared a national monument. The restored buildings today house a Foundation for the study of the Romanesque as well as a Secondary Education School.
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.