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:Sigmaringen Castle was first mentioned in the year 1077 in the chronicles of Petershausen monastery. The oldest parts of the castle are concealed beneath the alterations made during the 17th and the 19th centuries. The secret of the earliest settlement built on this defendable rock will never be fully revealed: large-scale excavation work would be necessary, which the extensive land development renders impossible. Judging from the many Roman remains unearthed in the area around Sigmaringen, the 12th century keep known as the 'Roman Tower' could be traced back to a Roman predecessor.
The castle remains that have been preserved (gate, great hall and keep) date back to the Staufer period around 1200. The castle remains were integrated into subsequent buildings. The foundations of the castle buildings are to a large extent identical to the surrounding castle wall.
These remains give us a good idea of how the castle might have looked during the 12th century.