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The 20 years' caliphate of al-Maʾmūn began as a stormy period in Middle Eastern history; after the comparatively peaceful reign of his father Hārūn al-Rashīd, the caliphate was plunged into violent civil warfare in both Iraq and Arabia, involving the sons of al-Rashīd, rivals for the supreme authority, and various other sectarian rebels and aspirants for power. Yet once peace was secured and the caliphate lands united once more, al-Maʾmūn's reign settled down into one of the most exciting and innovative of the mediaeval caliphate. The Caliph himself was a highly cultivated man who possessed a keen intellectual curiosity and who interested himself in the practical sciences, astronomy ...
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