Built by Hamdanis in 975-976, the citadel with its excellent stone work stands on a hill dominating the city. Ulu Mosque is Mardin’s oldest mosque built in the time of Artukid ruler, Kutbeddin Ilgaz in 1186. The 15th century Kasım Paşa Madrasah is remarkable for its fine stonework and at the lovely İsa Bey Madrasah from the 14th century you can admire the magnificently carved portal and climb to its roof to enjoy a fantastic view of the Mesopotamian plain.