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Other historians however, from the early 20th-century Syriac scholar E.W. Brooks to more recent ones such as Walter Kaegi and Ralph-Johannes Lilie, have challenged this view, attributing the reduced Arab threat after Akroinon to the fact that it coincided with other heavy reversals on the most remote provinces of the Caliphate, which exhausted its overextended military resources, as well as with internal turmoil due to civil wars and the Abbasid Revolution.
Its numerical decline in Khurasan meant that the Khurasan-born Arabs could no longer be completely controlled by force; this opened the way for the appointment of a native Khurasani Arab governor, Nasr ibn Sayyar, to succeed Asad, and, eventually, for the outbreak of the Abbasid Revolution that toppled the Umayyad regime.