Khan a-Shawarda (the Merchants' Inn) was most probably built by Dahar al-0mer in the 18th century. It has a square courtyard with the remains of a watering trough for livestock in its center. During the British Mandate, openings were made in the khan's courtyard from the north and the south in order to facilitate traffic. It is believed to be the site of a Clarissan Nuns convent dating back to the Crusader Period. History has it that when the Moslems took over the city, the nuns deliberately mutilated themselves by cutting off their noses so as not to surrender to the conquerors (Mondril made reference to this in 1697).
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.