Gurre Castle was a royal castle built in the 12th century. Four towers and a perimeter wall were added in the 1350s; it was excavated in the 19th century (from 1835) and is now restored. It is first mentioned in court chronicles in 1364, when Pope Urban V sent a gift of relics to its chapel.
The castle is associated with a legend about a Danish king named Waldemar (usually identified with the 14th-century Valdemar IV Atterdag), his love for his beautiful mistress Tove Lille (Little Tove) and the jealousy of Queen Helvig. Over the centuries, this core saga was enriched by other legends, eventually growing into a national myth of Denmark. Valdemar IV died in the castle in 1375. The myth was put into poetical form by the novelist and poet Jens Peter Jacobsen; a German translation of his poems forms the text of the huge cantata Gurrelieder by Arnold Schoenberg.
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.