These two castles represent the most significant examples illustrating the exchange of influences and documenting the evolution of fortified architecture in the Near East during the time of the Crusades (11th - 13th centuries). The Crac des Chevaliers was built by the Hospitaller Order of Saint John of Jerusalem from 1142 to 1271. With further construction by the Mamluks in the late 13th century, it ranks among the best-preserved examples of the Crusader castles. The Qal’at Salah El-Din (Fortress of Saladin), even though partly in ruins, represents an outstanding example of this type of fortification, both in terms of the quality of construction and the survival of historical stratigraphy. It retains features from its Byzantine beginnings in the 10th century, the Frankish transformations in the late 12th century and fortifications added by the Ayyubid dynasty (late 12th to mid-13th century).

Brief synthesis These two castles represent the most significant examples illustrating the exchange of influences and documenting the evolution of fortified architecture in the Near East during the Byzantine, Crusader and Islamic periods. The Crac des Chevaliers was built by the Hospitaller Order of Saint John of Jerusalem from 1142 to 1271. With further construction by the Mamluks in the late 13th century, it ranks among the best-preserved examples of the Crusader castles. The Qal'at Salah El-Din, even though partly in ruins, retains features from its Byzantine beginnings in the 10th century, the Frankish transformations in the late 12th century and fortifications added by the Ayyubid dynasty (late 12th to mid-13th century). Both castles are located on high ridges that were key defensive positions. Dominating their surrounding landscapes, the two castles of Crac des Chevaliers and Qal'at Salah El-Din are outstanding examples of fortified architecture relating to the Crusader period. Their quality of construction and the survival of historical stratigraphy demonstrate the interchange of defensive technology through features of each phase of military occupation. Criterion (ii): The castles represent a significant development in the fortification systems, which substantially differed from the European rather more passive defence systems, and which also contributed to the development of the castles in the Levant. Within the castles that have survived in the Near East, the property represents one of the most significant examples illustrating the exchange of influences and documenting the evolution in this field, which had an impact both in the East and in the West. Criterion (iv): In the history of architecture, the Crac des Chevaliers is taken as the best preserved example of the castles of the Crusader period, and it is also seen as an archetype of a medieval castle particularly in the context of the military orders. Similarly, the Qal'at Salah El-Din, even though…