Komotin Castle is a ruined castle in Bosnia and Herzegovina, in the Jajce Municipality. Komotin is believed to have been built in the early 14th century. The last Bosnian King Stephen Tomašević issued a charter which gave Komotin to his uncle Radivoj Kotromanić.
The architecture shows that komotin was a manorial court, but its positioning high on a hill that was difficult to access other than by narrow winding paths made it easily defendable. Once intruders and invaders had gotten up the path they then had a moat to contend with that could only be crossed by drawbridge. The walls of the manor were between 1.2 and 1.4 metres (3.9 and 4.6 ft) thick, with a rectangular shape. Within the walls was also a large and small bailey, plus quarters and accommodations.
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.