Which the arbitration at Adhruḥ (659) attempted to resolve, was disastrous: it split ʿAlī’s forces, some of his followers (Khawārij) refusing to acknowledge the validity of human arbitration in a case which they felt could be rightly decided only by God. ʿAlī’s position was also undermined when the arbitrators…

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result of Battle of Ṣiffīn
In Battle of Ṣiffīn
(fitnah; 656–661), ending in the arbitration of Adhruḥ (February 658–January 659), which undermined the authority of ʿAlī as fourth caliph and prepared for the establishment of the