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Al Qayrawan was set up as a provincial base of operations by the Umayyad dynasty. The city was a focal point of trade and politics in the region and therefore was subjected to countless attacks by groups vying for power in the region. Eventually, with the Almoravids and Almohads, Al Qayrawan seised to be a major city in North Africa and Algiers became the center of trade because of its coastal location and accessibility to other North African cities.“Algeria” The Encyclopædia Britannica Volume I. 15th ed. 1985http://en.wikipedia.org/wiki/Al_Qayrawan