How did ʿAlī die?

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After ʿAlī became caliph, some of his erstwhile supporters resented his willingness to negotiate his status with Muʿāwiyah and his forces, believing such concession to be a repudiation of his duty to fight against rebels. ʿAlī was struck in the head with a poisoned sword by a member of this movement (known as the Khārijites).