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town, southeastern Turkey. The town is situated on the Gorgarbonizra River where it passes through a narrow canyon and enters the plain. Nusaybin faces the Syrian town of Al-Qamishli and is 32 miles (51 km) south-southeast of Mardin. Strategically commanding the entrance to the upper Syrian plains from the mountain passes of Asia Minor, Nusaybin-then called Nisibis-was a frontier outpost of the Assyrian empire. Captured from the Armenian king Tigranes I the Great by the Roman Lucius Licinius Lucullus in 68 BC, it changed hands intermittently in the Roman-Parthian struggles, was conquered by the Persians in the 5th century, and was then taken by the Arabs about 640. It continued to prosper under the caliphs until the Mongol invasions of the 13th century. It finally declined as a result of invasions and internal troubles. A North African traveler, Ibn Battutah, who passed through in the 14th century, saw it in a state of decline that he attributed to the compulsory substitution of wheat for fruit crops