St. Maria im Kapitol is an 11th-century Romanesque church located in the Kapitol-Viertel in the old town of Cologne. It was dedicated to St. Mary and built between 1040 and 1065. It is one of twelve Romanesque churches built in Cologne during this period.
Measuring 100 m x 40 m and encompassing 4,000 square metres of internal space, St. Maria is the largest of the Romanesque churches in Cologne. Like many of the latter, it has an east end which is trefoil in shape, with three apses. It has a nave and aisles and three towers to the west. It is considered the most important work of German church architecture of the Salian dynasty.
The first Maria im Kapitol church is said to have been built by Plectrudis, wife of Pippin in the 8th century. The foundations of a Roman temple from the late 1st century AD, dedicated to the Capitoline Triad, and those of a church from the year 690 AD, can be visited in the church's crypt.
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.