Abstract
During its first half-century of existence, from the time of the revolution of 132/749 to the death of Hārūn al-Rashīd in 193/809, the 'Abbāsid caliphate embraced a huge area. From Ifrīqiya to the banks of the Indus and the deserts of Central Asia, governors were appointed to rule provinces, taxes were collected and armies sent to punish any who dared to rebel against the authority of the Commander of the Faithful. It is a very impressive achievement. If we seek an explanation of how this was possible from the great chroniclers of Islam, al-Ṭabarī, Ibn al-Athīr or al-Ya'qūbī, we are left with the impression that it was all very simple; the provinces were ruled by governors sent by the caliph and their authority was absolute until they were dismissed by their master. If any of the local people were so misguided as to attempt a rebellion, then units of the great Khurāsānī army, which had brought the dynasty to power, could be drafted in to chastise them. The system was, in short, an absolute military dictatorship.

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