Urfa is also identified as the birthplace of Abraham, which is commemorated by a mosque in the city, and as the birthplace of Job. Urfa was conquered repeatedly throughout history, and has been dominated by many civilizations, including the Ebla, Akkadians, Sumerians, Babylonians, Hittites, Hurris, Armenians, Mittannis, Assyrians, Chaldeans, Medes, Persians, Macedonians (under Alexander the Great), Seleucids, Arameans, Osrhoenes, Romans, Sassanids, Byzantines, Crusaders. Stay at least one night here so you have time to see Dergah, the center of the religious pilgrimage area; the wondrous medieval bazaar; the Throne of Nimrod fortress with a sacred pool full of fat carp at its foot; the good little museum; and some of the fine old houses. Sanliurfa Fortress is on the northern slope of Damlacik mountain to the south of the city. The citadel built by the Romans was later enlarged. The citadel has 25 watchtowers. It has remains from the Byzantine and Islamic times. The walls were built in 812 AD by the Christians to defend the city against Arab raids. The outer fortress was enlarged and restored by the Crusaders. The palaces of Molla, Gezer Pasha and Mehmet Pasha known to exist between the citadel and the outer fortress could not survive to our times. The economy of the province depends upon agriculture and animal husbandry. Its cultivable land is used mostly to grow cereals. Wheat is the main crop followed by barley and lentil. There is also chickpea farming and pistachio culture. Its industrial crops are cotton and sesame. Upon the completion of GAP, weight will be given to textiles and dress making. Also, the number and capacity of enterprises producing feed and vegetable oil will be enhanced to meet demands from domestic and external markets.