The castle of Amouda is a Crusader castle, formerly in the Armenian Kingdom of Cilicia, and today in the Turkish Province of Osmaniye. The castle was deeded by the Armenian king Levon I to the Teutonic Knights in 1212 and rebuilt by them in the 13th century. It earned revenue for the Teutonic Order from the surrounding land. According to contemporary sources, the castle provided shelter for 2,200 people during the invasion by the Mamluks in 1266.
In 1987 an archaeological and historical assessment of the site, as well as a surveyed plan, were published. From atop the outcrop this castle has clear inter-visibility with at least five others forts. Based on an analysis of the masonry, there were at least three major periods of construction and/or repair, with the most prominent contribution from the Crusader occupation. Unlike Armenian designs, it has a simple rectangular plan dominated at the southwest by a four-story keep with cisterns in the lowest level.
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.