St. Emmeram's Cathedral is a Roman Catholic cathedral located in the Nitra Castle precinct. It was originally built in the Gothic style and is composed of many parts. The upper church dates from 1333-1355. The rotunda dates back to the 11th-12th century and houses a silver reliquary made in 1674. Another reliquary in the cathedral houses some relics of Saint Cyril. The lower church was built between 1621-1642. Later on the entire cathedral complex was remodelled in the Baroque style.
Saint Emmeram of Regensburg, to whom the cathedral is dedicated, was an itinerant bishop who did missionary work from the court of the duke of Bavaria, Theodo I.
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.