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It depends on what period of history is being discussed. If you are referring to the Umayyad Empire when it was still ruled from Damascus, the largest defeat for them was in Poitiers when the Franks successfully prevented the conquest of the Frankish Lands (now known as France).

If you are referring to the Umayyad Caliphate based out of Córdoba in Al-Andaluz (Southern Spain), The Umayyads were unable to conquer the nascent Christian Kingdoms in the North which included but were not limited to: Leon, Castille, the Basque Territories, and the Catalonian Counties. In addition, the Umayyads were not able to prevent the fragmentation of their territory into the Taifa Kingdoms in 1038.

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12y ago

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