How did Charlemagne help Arab rulers of Barcelone?

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In 777, at Paderborn, Charlemagne received envoys from the Arab rulers of Barcelona and Zaragoza. They sought protection from the Umayyad Amir of Cordoba, Abd al-Rahman I, and in 778 Charlemagne led an expedition into the Ebro Valley. The eastern detachment of his forces approached Zaragoza through Barcelona, and the western detachment of his forces crossed the western end of the mountains and descended along the River Ebro. However, one of Charlemagne’s former Arab allies murdered the other, Frankish forces were refused admission to Barcelona, and Zaragoza was held against them. A Umayyad army approached the River Ebro from the south, and Charles was forced to withdraw his army...
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